Don't use -Werror with llvm-gcc.

Apple's llvm-gcc appears not to support suppressing warnings with
pragmas, so, if we're building on a Mac (we check for APPLE), and we're
not using Clang, we don't turn on -Werror, because we rely on those
pragmas to suppress otherwise-unremovable warnings in order to build
warning-free.

Change-Id: I43bd1ab42918c6ba22643b4a2d4cc3618c25434b
Reviewed-on: https://code.wireshark.org/review/29609
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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