use memcpy() instead of wxTmemcpy() as the latter is defined in wx/wxcrt.h which includes wx/string.h and hence can't be used from here

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54017 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/string.h

@@ -2895,7 +2895,7 @@ public:
                 len = lenWanted - 1;
             }
 
-            wxTmemcpy(m_buf.data(), buf, len + 1);
+            memcpy(m_buf.data(), buf, (len + 1)*sizeof(CharType));
         }
         //else: conversion failed, this can happen when trying to get Unicode
         //      string contents into a char string