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Add basic elf2tag(1) manpage #272

Job	Run time
macos-x86_64	1m 23s
linux-x86_64-autotools	1m 11s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 30s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 24s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 27s
linux-x86_64	1m 31s
mingw (mingw64, x86_64)	4m 4s
macos-x86_64-autotools	1m 1s
mingw (ucrt64, ucrt-x86_64)	4m 8s
msvc (x86, Win32)	2m 30s
mingw (clang64, clang-x86_64)	3m 23s
msvc (x64, x64)	1m 50s
msvc (arm64, ARM64)	2m 8s
	27m 30s

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