Configure: use a better method to identify gcc and derivates
Looking for 'gcc' and 'clang' in the output from the C compiler is uncertain. Some versions report argv[0], which might be /usr/bin/cc (for example), and others might mention gcc without being gcc or a derivate. Better then to fetch predefined macros and checking if __GNUC__ and __clang__ are defined. Reviewed-by:Andy Polyakov <appro@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4755)
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