Make command line parsing and help output consistent.

The -test option is currently "silently accepted" even if WITH_TESTS
was not set.

Change-Id: Ie969802593da28c6b05b60479dffbd495802fc47
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/libs/extensionsystem/optionsparser.cpp

@@ -73,8 +73,10 @@ bool OptionsParser::parse()
             continue;
         if (checkForProfilingOption())
             continue;
+#ifdef WITH_TESTS
         if (checkForTestOption())
             continue;
+#endif
         if (checkForAppOption())
             continue;
         if (checkForPluginOption())