Make the build parser for custom build steps depend on the toolchain

The API addtition to BuildConfiguration of knowing of the default parser
is rather strange, but a necessary evil for this.

Reviewed-By: Thorbjorn

Task-Nr: QTCREATORBUG-514

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp

@@ -153,6 +153,13 @@ void CMakeBuildConfiguration::setMsvcVersion(const QString &msvcVersion)
     emit msvcVersionChanged();
 }
 
+ProjectExplorer::IOutputParser *CMakeBuildConfiguration::createOutputParser() const
+{
+    if (m_toolChain)
+        return m_toolChain->outputParser();
+    return 0;
+}
+
 /*!
   \class CMakeBuildConfigurationFactory
 */