A better fix for wxHash{Map,Set} with g++ 4.7.

This reverts r70556, i.e. removes the scope operators added by it to all
WX_DECLARE_HASH_{MAP,SET} macros, and implements a workaround for the problem
due to the use of empty base class optimization in g++ 4.7 standard library
implementations inside the macros themselves by prepending the hasher and
comparator classes with explicit "struct".

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72297 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/xrc/xmlres.cpp

@@ -107,7 +107,7 @@ class wxXmlResourceDataRecords : public wxVector<wxXmlResourceDataRecord*>
     // this is a class so that it can be forward-declared
 };
 
-WX_DECLARE_HASH_SET_PTR(int, ::wxIntegerHash, ::wxIntegerEqual, wxHashSetInt);
+WX_DECLARE_HASH_SET_PTR(int, wxIntegerHash, wxIntegerEqual, wxHashSetInt);
 
 class wxIdRange // Holds data for a particular rangename
 {