c924ecb10a
This was already done for clang -Winconsistent-missing-override, but gcc has a similar warning since 5.1 and, moreover, latest versions of clang support this gcc warning as well, so add a special macro which handles both compilers and use it in all wx macros defining virtual functions instead of just disabling one of the clang warnings. Closes https://github.com/wxWidgets/wxWidgets/pull/2000