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Add basic elf2tag(1) manpage #303

Job	Run time
linux-x86_64	1m 40s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 27s
linux-x86_64-autotools	2m 22s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 21s
macos-x86_64	28s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 27s
macos-x86_64-autotools	37s
mingw (mingw64, x86_64)	3m 47s
msvc (x86, Win32)	1m 58s
mingw (ucrt64, ucrt-x86_64)	3m 52s
msvc (x64, x64)	2m 18s
mingw (clang64, clang-x86_64)	2m 49s
msvc (arm64, ARM64)	2m 19s
	26m 25s

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