Add wxIntegerValidatorBase::ULongestValueType typedef

Allow just writing ULongestValueType instead of writing #ifdefs in
several places.

include/wx/valnum.h

@@ -293,8 +293,10 @@ protected:
     // on it.
 #ifdef wxLongLong_t
     typedef wxLongLong_t LongestValueType;
+    typedef wxULongLong_t ULongestValueType;
 #else
     typedef long LongestValueType;
+    typedef unsigned long ULongestValueType;
 #endif
 
     wxIntegerValidatorBase(int style)

src/common/valnum.cpp

@@ -244,11 +244,7 @@ wxIntegerValidatorBase::FromString(const wxString& s,
     else
     {
         // Parse as unsigned to ensure we don't accept minus sign here.
-#ifdef wxULongLong_t
-        wxULongLong_t uvalue;
-#else
-        unsigned long uvalue;
-#endif
+        ULongestValueType uvalue;
         if ( !wxNumberFormatter::FromString(s, &uvalue) )
             return false;