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Add basic elf2tag(1) manpage #268

Job	Run time
linux-x86_64	1m 46s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 30s
macos-x86_64	54s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 21s
linux-x86_64-autotools	1m 16s
macos-x86_64-autotools	1m 6s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 25s
mingw (mingw64, x86_64)	3m 37s
msvc (x86, Win32)	2m 6s
mingw (ucrt64, ucrt-x86_64)	4m 3s
msvc (x64, x64)	1m 39s
mingw (clang64, clang-x86_64)	2m 51s
msvc (arm64, ARM64)	2m 22s
	25m 56s

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