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Add support for long options like --part #329

Job	Run time
linux-x86_64	1m 48s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 29s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 22s
linux-x86_64-autotools	1m 7s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 21s
macos-x86_64	56s
macos-x86_64-autotools	54s
mingw (mingw64, x86_64)	3m 38s
mingw (ucrt64, ucrt-x86_64)	3m 39s
msvc (x86, Win32)	1m 58s
msvc (x64, x64)	2m 1s
mingw (clang64, clang-x86_64)	2m 56s
msvc (arm64, ARM64)	2m 19s
	25m 28s

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