pip install fails on Cygwin

I was updating my AWSCLI v2 from 2.1.29 to 2.2.3 and I got this AWSCRT build/install error:
```
{...}
Building wheels for collected packages: awscrt, cryptography
ERROR: Command errored out with exit status 1:
command: /cygdrive/c/Users/allen/.virtualenvs/awscliv2/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py'"'"'; __file__='"'"'/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-z_23s1ai/install-record.txt --single-version-externally-managed --compile --install-headers /cygdrive/c/Users/allen/.virtualenvs/awscliv2/include/site/python3.8/awscrt
cwd: /tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/
Complete output (56 lines):
running install
running build
running build_py
creating build/lib.cygwin-3.2.0-x86_64-3.8
creating build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/auth.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/common.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/crypto.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/exceptions.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/http.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/io.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/mqtt.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/s3.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/_test.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
copying awscrt/__init__.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt
creating build/lib.cygwin-3.2.0-x86_64-3.8/awscrt/eventstream
copying awscrt/eventstream/rpc.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt/eventstream
copying awscrt/eventstream/__init__.py -> build/lib.cygwin-3.2.0-x86_64-3.8/awscrt/eventstream
running build_ext
--- Building dependency: aws-lc (RelWithDebInfo) ---
/cygdrive/c/ProgramData/scoop/shims/cmake -DCMAKE_PREFIX_PATH=/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/build/deps/install -DCMAKE_INSTALL_PREFIX=/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/build/deps/install -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_TESTING=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DBUILD_LIBSSL=OFF /tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/crt/aws-lc
CMake Error: The source directory "/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/crt/aws-lc" does not exist.
Specify --help for usage, or press the help button on the CMake GUI.
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py", line 263, in
setuptools.setup(
File "/cygdrive/c/Users/allen/.virtualenvs/awscliv2/lib/python3.8/site-packages/setuptools/__init__.py", line 153, in setup
return distutils.core.setup(**attrs)
File "/usr/lib/python3.8/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/cygdrive/c/Users/allen/.virtualenvs/awscliv2/lib/python3.8/site-packages/setuptools/command/install.py", line 61, in run
return orig.install.run(self)
File "/usr/lib/python3.8/distutils/command/install.py", line 556, in run
self.run_command('build')
File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/usr/lib/python3.8/distutils/command/build.py", line 135, in run
self.run_command(cmd_name)
File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
cmd_obj.run()
File "/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py", line 197, in run
self._build_dependency(lib)
File "/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py", line 175, in _build_dependency
subprocess.check_call(cmake_args)
File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/cygdrive/c/ProgramData/scoop/shims/cmake', '-DCMAKE_PREFIX_PATH=/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/build/deps/install', '-DCMAKE_INSTALL_PREFIX=/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/build/deps/install', '-DBUILD_SHARED_LIBS=OFF', '-DCMAKE_BUILD_TYPE=RelWithDebInfo', '-DBUILD_TESTING=OFF', '-DCMAKE_POSITION_INDEPENDENT_CODE=ON', '-DBUILD_LIBSSL=OFF', '/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/crt/aws-lc']' returned non-zero exit status 1.
----------------------------------------
ERROR: Command errored out with exit status 1: /cygdrive/c/Users/allen/.virtualenvs/awscliv2/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py'"'"'; __file__='"'"'/tmp/pip-install-logv0wqy/awscrt_3b94cb75e77f40b88a9c8fd739e1e147/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-z_23s1ai/install-record.txt --single-version-externally-managed --compile --install-headers /cygdrive/c/Users/allen/.virtualenvs/awscliv2/include/site/python3.8/awscrt Check the logs for full command output.
```

Basic Python information:
```
$ python -V
Python 3.8.10
$ pip -V
pip 21.0.1 from /cygdrive/c/Users/allen/.virtualenvs/awscliv2/lib/python3.8/site-packages/pip (python 3.8)
$ virtualenv --version
virtualenv 20.4.2 from /cygdrive/c/Users/allen/.virtualenvs/awscliv2/lib/python3.8/site-packages/virtualenv/__init__.py
$ aws --version
aws-cli/2.1.29 Python/3.8.10 CYGWIN_NT-10.0-19042/3.2.0-340.x86_64 source/x86_64 prompt/off
$ uname -a
CYGWIN_NT-10.0 FOUREYES 3.2.0(0.340/5/3) 2021-03-29 08:42 x86_64 Cygwin
```