tests

Remove support for returning the directories created in mkpath, unused. #1185

Job	Run time
test_cygwin (39, windows-latest)	4m 37s
ci_setuptools (3.10, ubuntu-latest)	3m 47s
collateral (diffcov)	41s
test (3.8, ubuntu-latest)	36s
collateral (docs)	33s
test_msvc_python_mingw	2m 15s
test (3.8, macos-latest)	1m 41s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 52s
test (3.8, windows-latest)	2m 11s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 13s
test (3.13, ubuntu-latest)	49s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 51s
test (3.13, macos-latest)	41s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 59s
test (3.13, windows-latest)	2m 50s
test (3.9, ubuntu-latest)	37s
test (3.10, ubuntu-latest)	40s
test (3.11, ubuntu-latest)	36s
test (3.12, ubuntu-latest)	44s
test (3.14, ubuntu-latest)	57s
test (pypy3.10, ubuntu-latest)	1m 33s
check	4s
release	0s
	33m 47s

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