The bin-* and lib-* files are used for testing the
Sys::Guestfs::Lib::file_architecture API.

The bin-* files are generated from empty source files (ie.
"main(){}") on the respective architectures.

The lib-* files are generated from a (really) empty source file called
lib.c which is linked into a library using gcc -shared on the
respective architectures.

If you are concerned that these binary files "lack source" then you
can just remove them, but you may need to patch out tests in the perl/
directory.