Add support for i686, aarch64 and riscv64 to SharedLibsRule

Haochen Tongrequested to merge
hexchain/namcap:other-arch into master

Add support for some non-x86 architectures.

It tries to guess e_machine and EI_CLASS based on the current machine type and ldconfig -p output, and matches shared libraries based on "arch identifiers" (which are basically tuples of e_machine and EI_CLASS).

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