autoconf #19

Job	Run time
llvm-mingw (msvcrt)	22m 32s
llvm-mingw (ucrt)	23m 20s
llvm-mingw (ucrtbase)	23m 2s
gcc (ucrt, x86_64)	19m 47s
gcc (msvcrt, i686)	20m 5s
gcc (msvcrt, x86_64)	19m 51s
gcc (ucrt, i686)	19m 25s
gcc-cross (msvcrt, i686)	17m 50s
gcc-cross (ucrt, i686)	18m 48s
gcc-cross (msvcrt, x86_64)	19m 27s
gcc-cross (ucrt, x86_64)	17m 47s
test-libcxx (x86_64, i686-w64-mingw32-)	1h 9m 57s
test-llvm-mingw (x86_64, ucrtbase)	3m 30s
test-libcxx (x86_64)	1h 11m 10s
test-llvm-mingw (i686, msvcrt)	3m 29s
test-llvm-mingw (x86_64, ucrt)	3m 37s
test-llvm-mingw (i686, ucrtbase)	3m 39s
test-ffmpeg (x86_64)	18m 19s
linux-test-cross-build-ffmpeg (x86_64)	5m 51s
test-ffmpeg (i686)	17m 47s
test-llvm-mingw (i686, ucrt)	3m 38s
linux-test-cross-build-ffmpeg (armv7)	4m 18s
linux-test-cross-build-ffmpeg (i686)	5m 1s
test-llvm-mingw (x86_64, msvcrt)	3m 42s
linux-test-cross-build-ffmpeg (aarch64)	4m 46s
test-gcc (msvcrt, x86_64)	55s
test-gcc (ucrt, i686)	53s
test-gcc (ucrt, x86_64)	40s
test-gcc (msvcrt, i686)	34s
	7h 23m 40s

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