MinGW: `CATCH_CONFIG_MAIN` defines the non-standard `WinMain` instead of the standard `main` function

**Describe the bug**
Once you define the `CATCH_CONFIG_MAIN` definition on MinGW, it defines a non-standard main function called WinMain. This results in a lot of undefined references. This doesn't happen with other compilers.

https://github.com/aminya/cpp_vcpkg_project/runs/6542106054?check_suite_focus=true#step:6:203

```ps1
[6/18] Linking CXX executable my_exe\test\Debug\my_exe_helpers_tests.exe
FAILED: my_exe/test/Debug/my_exe_helpers_tests.exe
cmd.exe /C "cd . && C:\Users\runneradmin\gcc\mingw64\bin\g++.exe -g my_exe/test/CMakeFiles/my_exe_helpers_tests.dir/Debug/tests.cpp.obj -o my_exe\test\Debug\my_exe_helpers_tests.exe -Wl,--out-implib,my_exe\test\Debug\libmy_exe_helpers_tests.dll.a -Wl,--major-image-version,0,--minor-image-version,0 vcpkg_installed/x64-mingw-static/debug/lib/libfmtd.a --coverage -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
c:/users/runneradmin/gcc/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:/users/runneradmin/gcc/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.3.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text+0x46): undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status
[7/18] Linking CXX executable my_lib\test\Debug\my_lib_tests.exe
FAILED: my_lib/test/Debug/my_lib_tests.exe my_lib/test/my_lib_tests_tests-84286ba.cmake D:/a/cpp_vcpkg_project/cpp_vcpkg_project/build/my_lib/test/my_lib_tests_tests-84286ba.cmake
cmd.exe /C "cd . && C:\Users\runneradmin\gcc\mingw64\bin\g++.exe -g my_lib/test/CMakeFiles/my_lib_tests.dir/Debug/tests.cpp.obj -o my_lib\test\Debug\my_lib_tests.exe -Wl,--out-implib,my_lib\test\Debug\libmy_lib_tests.dll.a -Wl,--major-image-version,0,--minor-image-version,0 my_lib/Debug/libmy_lib.a --coverage vcpkg_installed/x64-mingw-static/debug/lib/libfmtd.a -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cmd.exe /C "cd /D D:\a\cpp_vcpkg_project\cpp_vcpkg_project\build\my_lib\test && C:\Users\runneradmin\cmake\cmake-3.23.1-windows-x86_64\bin\cmake.exe -D TEST_TARGET=my_lib_tests -D TEST_EXECUTABLE=D:/a/cpp_vcpkg_project/cpp_vcpkg_project/build/my_lib/test/Debug/my_lib_tests.exe -D TEST_EXECUTOR= -D TEST_WORKING_DIR=D:/a/cpp_vcpkg_project/cpp_vcpkg_project/build/my_lib/test -D TEST_SPEC= -D TEST_EXTRA_ARGS= -D TEST_PROPERTIES= -D TEST_PREFIX= -D TEST_SUFFIX= -D TEST_LIST=my_lib_tests_TESTS -D TEST_REPORTER=xml -D TEST_OUTPUT_DIR= -D TEST_OUTPUT_PREFIX= -D TEST_OUTPUT_SUFFIX= -D CTEST_FILE=D:/a/cpp_vcpkg_project/cpp_vcpkg_project/build/my_lib/test/my_lib_tests_tests-84286ba.cmake -P D:/a/cpp_vcpkg_project/cpp_vcpkg_project/build/vcpkg_installed/x64-mingw-static/share/catch2/CatchAddTests.cmake""
c:/users/runneradmin/gcc/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:/users/runneradmin/gcc/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.3.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text+0x46): undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status
[8/18] Building CXX object my_header_lib/test/constexpr/CMakeFiles/my_header_lib_relaxed_constexpr_tests.dir/Debug/constexpr_tests.cpp.obj
Checking D:\a\cpp_vcpkg_project\cpp_vcpkg_project\my_header_lib\test\constexpr\constexpr_tests.cpp ...
Checking D:\a\cpp_vcpkg_project\cpp_vcpkg_project\my_header_lib\test\constexpr\constexpr_tests.cpp: CATCH_CONFIG_MAIN=1;CATCH_CONFIG_RUNTIME_STATIC_REQUIRE=1;FMT_LOCALE=1;UNICODE=1;_UNICODE=1;CMAKE_INTDIR="Debug"...
ninja: build stopped: subcommand failed.
task: Failed to run task "coverage": task: Failed to run task "build_template": exit status 1

```

**Expected behavior**
`CATCH_CONFIG_MAIN` should define a standard main on MinGW

**Reproduction steps**

- Install MinGW from [here](https://github.com/brechtsanders/winlibs_mingw/releases)
- Clone this branch: https://github.com/aminya/cpp_vcpkg_project/tree/mingw
- Then run `task test` or `make test`

**Platform information:**

- OS: **Windows NT**
- Compiler+version: **GCC v11**
- Catch version: **v2.13.7**

**Additional context**

Blocks https://github.com/aminya/project_options/issues/129
Related issues:
- https://github.com/brechtsanders/winlibs_mingw/issues/106
- https://sourceforge.net/p/mingw-w64/bugs/942/
- https://github.com/catchorg/Catch2/issues/1287