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Improve compatibility for cross-platform testing.
Avoid warning for ignoring chown() return value on some glibc's, and change compiler from cc to gcc. Sometimes the (void) before chown() is not sufficient to signal the programmer's intent to ignore the return value. (Thank you return-value police.) This commit kills that gcc warning just for copymeta(). Using pragma then required ignoring a warning for versions of gcc that don't recognize it (when using -Wall). Finally, gcc is used instead of cc for platforms that don't make that equivalency.
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