Clang unusual switches wrongly hardcoded in resulting setup.py

After compiling manually (cmake and make with many switches and changes to CmakeList.txt file), Python kvetches that:

clang++: error: unknown argument: '-fno-openmp-implicit-rpath'                                              clang++: error: unknown argument: '-fno-openmp-implicit-rpath'                                          error: command '/data/data/com.termux/files/usr/bin/clang++' failed with exit code 1                error: subprocess-exited-with-error

amd:

clang++: error: unknown argument: '-fno-openmp-implicit-rpath'

Grep shows it hardcoded:

~/.../CTranslate2/python $ grep visibility . -r      ./setup.py:cflags = ["-std=c++17", "-fvisibility=hidden"]


...
~/.../CTranslate2/python $ grep rpath . -r           ./setup.py:    ldflags.append("-Wl,-rpath,/usr/local/lib")                                                ~/.../CTranslate2/python $

so we must trim it to:
./setup.py:cflags = ["-std=c++17"]
etc.

-> Do change.

With fixes:

~/.../CTranslate2/python $ pip install -v .          Using pip 24.0 from /data/data/com.termux/files/usr/lib/python3.11/site-packages/pip (python 3.11)
...
clang -DNDEBUG -g -fwrapv -O3 -Wall -fstack-protector-strong -O3 -fstack-protector-strong -O3 -fuse-ld=lld -pthread -g -march=armv8-a -mtune=cortex-a53 -Wall -Wextra -fPIC -I/data/data/com.termux/files/usr/lib/python3.11/site-packages/pybind11/include -I/data/data/com.termux/files/usr/include/python3.11 -c cpp/mpi.cc -o build/temp.linux-aarch64-cpython-311/cpp/mpi.o -std=c++17
...

etc and installs.

My box:
Compiler:

• GCC Version: ndk-sysroot/tur-packages, (26b-3).
• g++ (symbolic link to clang-18), clang version 18.1.5
  Target: aarch64-unknown-linux-android24
  Thread model: posix
  InstalledDir: /data/data/com.termux/files/usr/bin
• Make version:
  GNU Make 4.4.1
  Built for aarch64-unknown-linux-android
• Abseil C++ library: 20240116.2 for the AArch64

Python Environment:

• Python Version: 3.11.9
• pip Version: 24.0
• Cython Version: 3.0.10
• setuptools Version: 69.5.1
• PyTorch Version: 2.1.2 *
• numpy Version: 1.26.4 *

Start in python/setup.py, where the issue reports hardcoded C++ flags and the /usr/local/lib rpath. Run pip install -v . in the reported environment to reproduce the generated compiler command. Done means the unsupported Clang switches are no longer added and the package installs successfully.