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

include/wx/html/htmlpars.h

@@ -29,7 +29,7 @@ class wxHtmlTextPieces;
 class wxHtmlParserState;
 
 WX_DECLARE_HASH_SET_WITH_DECL_PTR(wxHtmlTagHandler*,
-                                  ::wxPointerHash, ::wxPointerEqual,
+                                  wxPointerHash, wxPointerEqual,
                                   wxHtmlTagHandlersSet,
                                   class WXDLLIMPEXP_HTML);
 WX_DECLARE_STRING_HASH_MAP_WITH_DECL(wxHtmlTagHandler*,