build: Explicitly disable warnings for non-ISO C features
libglnx is intentionally not portable to non-Unix platforms or to compilers that do not implement gcc/clang extensions, so it's counterproductive to warn about these extensions, even if libglnx is used by a parent project that generally (for the parts that don't use libglnx) wants to be portable to any ISO C compiler. Suggested by Will Thompson on !36. Signed-off-by:Simon McVittie <smcv@collabora.com>
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