crt: Use naked functions for assembly functions. #25

Job	Run time
llvm-mingw (ucrt)	23m 29s
gcc (msvcrt, i686)	18m 33s
llvm-mingw (msvcrt)	23m 59s
gcc (ucrt, i686)	19m 33s
gcc (msvcrt, x86_64)	19m 33s
llvm-mingw (ucrtbase)	23m 41s
gcc (ucrt, x86_64)	20m 54s
gcc-cross (ucrt, x86_64)	18m 54s
gcc-cross (msvcrt, i686)	17m 32s
gcc-cross (msvcrt, x86_64)	17m 58s
gcc-cross (ucrt, i686)	17m 18s
test-ffmpeg (x86_64)	18m 29s
linux-test-cross-build-ffmpeg (i686)	5m 5s
test-ffmpeg (i686)	17m 4s
linux-test-cross-build-ffmpeg (armv7)	4m 30s
linux-test-cross-build-ffmpeg (aarch64)	4m 46s
linux-test-cross-build-ffmpeg (x86_64)	5m 56s
test-llvm-mingw (x86_64, ucrtbase)	3m 36s
test-llvm-mingw (i686, msvcrt)	3m 37s
test-llvm-mingw (i686, ucrtbase)	3m 33s
test-llvm-mingw (x86_64, msvcrt)	3m 37s
test-llvm-mingw (i686, ucrt)	3m 32s
test-libcxx (x86_64, i686-w64-mingw32-)	1h 11m 4s
test-libcxx (x86_64)	1h 9m 11s
test-llvm-mingw (x86_64, ucrt)	3m 31s
test-gcc (msvcrt, x86_64)	42s
test-gcc (ucrt, x86_64)	43s
test-gcc (ucrt, i686)	42s
test-gcc (msvcrt, i686)	40s
	7h 21m 42s

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