tests

cygwinccompiler: Get the compilers from sysconfig #85

Job	Run time
test_cygwin (39, windows-latest)	3m 17s
ci_setuptools (3.10, ubuntu-latest)	3m 41s
collateral (diffcov)	44s
test (3.8, ubuntu-latest)	41s
collateral (docs)	28s
test (3.8, macos-latest)	1m 48s
test_msvc_python_mingw	1m 52s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 41s
test (3.8, windows-latest)	2m 23s
test_msys2_mingw (mingw32, i686, gcc, g++)	1m 46s
test (3.12, ubuntu-latest)	44s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 36s
test (3.12, macos-latest)	47s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 51s
test (3.12, windows-latest)	2m 31s
test (3.9, ubuntu-latest)	37s
test (3.10, ubuntu-latest)	55s
test (3.11, ubuntu-latest)	37s
test (pypy3.10, ubuntu-latest)	1m 28s
check	1s
release	0s
	29m 28s

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