Remove legacy msvc compiler modules. #1111

Job	Run time
ci_setuptools (3.10, ubuntu-latest)	3m 45s
collateral (diffcov)	50s
test (3.8, ubuntu-latest)	46s
collateral (docs)	38s
test_cygwin (39, windows-latest)	4m 37s
test (3.8, macos-latest)	1m 20s
test (3.8, windows-latest)	2m 6s
test_msvc_python_mingw	1m 58s
test (3.12, ubuntu-latest)	44s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 37s
test (3.12, macos-latest)	58s
test_msys2_mingw (mingw32, i686, gcc, g++)	1m 47s
test (3.12, windows-latest)	1m 46s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 35s
test (3.9, ubuntu-latest)	38s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 51s
test (3.10, ubuntu-latest)	39s
test (3.11, ubuntu-latest)	39s
test (pypy3.10, ubuntu-latest)	1m 41s
check	2s
release	0s
	29m 57s

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