Build and install llvm-readobj, also install it as llvm-readelf

Useful on architectures not actually supported by our ancient binutils
(arm64, powerpc64, riscv64), or on architectures incompletely s

Build and install llvm-readobj, also install it as llvm-readelf

Useful on architectures not actually supported by our ancient binutils
(arm64, powerpc64, riscv64), or on architectures incompletely supported
(eg recent features on amd64).

ok kettenis@ sthen@

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