Add long options like --part #2694

Job	Run time
macos-x86_64-autotools	51s
linux-x86_64-autotools	1m 16s
macos-x86_64	56s
linux-x86_64	1m 54s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	12s
mingw (mingw64, x86_64)	3m 50s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	23s
mingw (ucrt64, ucrt-x86_64)	3m 45s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	18s
msvc (x86, Win32)	2m 14s
mingw (clang64, clang-x86_64)	2m 39s
msvc (x64, x64)	2m 29s
msvc (arm64, ARM64)	2m 47s
	23m 34s

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