C++: Fix parsing enum specifier II

This amends the obviously wrong
de975aca4f, which did not honored nameless
enum specifiers.

This fixes e.g. "Find Usages" for declarations following "enum {};".

Change-Id: Id98c074156f576b9a63e6c25dab38721ca34e496
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/libs/3rdparty/cplusplus/Parser.cpp

@@ -1835,10 +1835,8 @@ bool Parser::parseEnumSpecifier(SpecifierListAST *&node)
             return false;
         }
 
-        if (LA() == T_IDENTIFIER)
+        if (LA() == T_COLON_COLON && LA() == T_IDENTIFIER)
             parseName(ast->name);
-        else
-            return false;
 
         if (_languageFeatures.cxx11Enabled && LA() == T_COLON) {
             ast->colon_token = consumeToken();