consolidate __xstat abi-compat functions into a single source file

these are mostly intended for use with dynamic linking (although they
can also be used statically with object files compiled against glibc
headers), so having them broken down into separate source files to
optimize for static linking is unlikely to be worth the cost having
more files in the source tree (which contributes to libc.a overhead,
compile time, link time, ar/linker command line size exhaustion, and
so on).

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