Unconditionally add -Wextra GCC/Clang option and remove GCC_WEXTRA macro #190
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Unconditionally add -Wextra to GCC and Clang compiler options instead of using the GCC_WEXTRA macro. -Wextra was added in GCC 3.4.0, which is 20 years old now, and has always been supported by Clang. There are no supported systems with earlier GCC versions.