CppTools: Fix compilation with MSVC2010

error: C2872: 'Internal' : ambiguous symbol
could be 'CppTools::Internal'
or       'CPlusPlus::Internal'

Change-Id: Iff623400a370b056fb30838e0b97bdc9d6898d00
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/cpptools/searchsymbols.cpp

@@ -42,7 +42,7 @@ SearchSymbols::SymbolTypes SearchSymbols::AllTypes =
         | SymbolSearcher::Enums
         | SymbolSearcher::Declarations;
 
-SearchSymbols::SearchSymbols(Internal::StringTable &stringTable)
+SearchSymbols::SearchSymbols(CppTools::Internal::StringTable &stringTable)
     : strings(stringTable)
     , symbolsToSearchFor(SymbolSearcher::Classes | SymbolSearcher::Functions | SymbolSearcher::Enums)
 {