Try to fix Cppcheck self-check warnings

lib/clangimport.cpp

@@ -660,7 +660,7 @@ Scope *clangimport::AstNode::createScope(TokenList *tokenList, Scope::ScopeType
             if (replaceVar.find(&(*var)) != replaceVar.end())
                 varlist.erase(var++);
             else
-                var++;
+                ++var;
         }
     }
     scope->bodyStart = addtoken(tokenList, "{");

lib/symboldatabase.h

@@ -246,6 +246,8 @@ public:
 
     ~Variable();
 
+    Variable &operator=(const Variable &var) = delete;
+
     /**
      * Get name token.
      * @return name token