Return real boolean from copy_file #1191

Job	Run time
ci_setuptools (3.10, ubuntu-latest)	3m 53s
test_cygwin (39, windows-latest)	4m 54s
collateral (diffcov)	49s
test (3.8, ubuntu-latest)	39s
collateral (docs)	28s
test_msvc_python_mingw	2m 24s
test (3.8, macos-latest)	49s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 39s
test_msys2_mingw (mingw32, i686, gcc, g++)	1m 53s
test (3.8, windows-latest)	40s
test (3.13, ubuntu-latest)	49s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 40s
test (3.13, macos-latest)	47s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 40s
test (3.13, windows-latest)	34s
test (3.9, ubuntu-latest)	42s
test (3.10, ubuntu-latest)	39s
test (3.11, ubuntu-latest)	35s
test (3.12, ubuntu-latest)	46s
test (3.14, ubuntu-latest)	48s
test (pypy3.10, ubuntu-latest)	47s
check	2s
release	0s
	27m 57s

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