remove unused macro definitions

and limit others to the configurations which use them

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/string.cpp

@@ -48,18 +48,16 @@
     #include <sstream>
 #endif
 
+#ifndef HAVE_STD_STRING_COMPARE
 // string handling functions used by wxString:
 #if wxUSE_UNICODE_UTF8
-    #define wxStringMemcpy   memcpy
     #define wxStringMemcmp   memcmp
-    #define wxStringMemchr   memchr
     #define wxStringStrlen   strlen
 #else
-    #define wxStringMemcpy   wxTmemcpy
     #define wxStringMemcmp   wxTmemcmp
-    #define wxStringMemchr   wxTmemchr
     #define wxStringStrlen   wxStrlen
 #endif
+#endif
 
 // define a function declared in wx/buffer.h here as we don't have buffer.cpp
 // and don't want to add it just because of this simple function