C++: Revive TranslationUnit::blockErrors()

Removed in f0f406ba

Required when CPLUSPLUS_NO_DEBUG_RULE is uncommented

Change-Id: I18ce50a84ed1ac4a77ca0aaa9d38ef070587ce49
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/3rdparty/cplusplus/TranslationUnit.h

@@ -82,6 +82,7 @@ public:
     MemoryPool *memoryPool() const;
     AST *ast() const;
 
+    bool blockErrors() const { return f._blockErrors; }
     bool blockErrors(bool block)
     {
         const bool previous = f._blockErrors;