Don't redo the tests already done in wx/wxcrtbase.h in wx/string.h too, especially as they were not done correctly there (they didn't take into account the case of MinGW in strict ANSI mode). Just call wxCRT_StricmpA(). This also allows us to get rid of HAVE_STRCASECMP_IN_STRING[S]_H tests in configure. Closes #15349. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74571 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775