gcc 3.x -Wshadow warning fix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/string.h

@@ -833,7 +833,7 @@ public:
     // returns true if the string is empty
   bool empty() const { return IsEmpty(); }
     // inform string about planned change in size
-  void reserve(size_t size) { Alloc(size); }
+  void reserve(size_t sz) { Alloc(sz); }
 
   // lib.string.access
     // return the character at position n