Unify "missing compiler" and "missing build configuration" tasks

Everybody used to do their own thing...

Also unify the "Configuration is faulty" message we write into the
Application output window.

Change-Id: I0e5c4ec68155d66aa1d0ea53134b98917869e5c6
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/abstractprocessstep.cpp

@@ -149,6 +149,12 @@ ProjectExplorer::IOutputParser *AbstractProcessStep::outputParser() const
     return m_outputParserChain;
 }
 
+void AbstractProcessStep::emitFaultyConfigurationMessage()
+{
+    emit addOutput(tr("Configuration is faulty. Check the Issues view for details."),
+                   BuildStep::MessageOutput);
+}
+
 bool AbstractProcessStep::ignoreReturnValue()
 {
     return m_ignoreReturnValue;