Fixed FOLLY_ELF_NATIVE_ClASS definition for non-glibc systems

[maxirmx]

A fix for #1478

Rationale:

If __ELF_NATIVE_CLASS is defined it is GLIBC environment
If __ELF_NATIVE_CLASS is not defined but __GNUC__ is defined it is gcc or compatible compiler in non-GLIBC environment (FreeBSD, musl, whatever). gcc or compatible compiler will have __LP64__ defined if appropriate

cc: @ronaldtse

This is a contribution from Tebako (GitHub), a product of Ribose (GitHub).

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