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Update README.md #895

Job	Run time
Windows (Win32)	2m 27s
GCC -O0	1m 59s
GCC -Os, old Autotools	1m 0s
Clang (-O0)	2m 34s
Clang (-O2)	3m 33s
GCC -O3	1m 4s
GCC -Os, CMake+ninja, no JIT	57s
manyconfig	26m 51s
perl	21s
CMake unity build	41s
MSYS2	0s
Multiarch	0s
Windows (x64)	58s
Check autogenerated file freshness	16s
Bazel	0s
Zig	0s
	42m 41s

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