BuildConfiguration: Introduce signal buildTypeChanged()

Needed by android plugin.

Change-Id: I46543d4889e0e740697439e18e9c1ea0d3fef222
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp

@@ -101,6 +101,11 @@ void CMakeBuildConfiguration::setUseNinja(bool useNninja)
     }
 }
 
+void CMakeBuildConfiguration::emitBuildTypeChanged()
+{
+    emit buildTypeChanged();
+}
+
 CMakeBuildConfiguration::~CMakeBuildConfiguration()
 { }