CppTools: Add target information to ProjectPart

This is important to be able to map sources to actual things that are
going to be built.

Change-Id: I1aef940767d60192642ed79a1703cff8dfdad9e1
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -996,6 +996,7 @@ void QbsProject::updateCppCodeModel()
             rpp.setDisplayName(grp.name());
             rpp.setProjectFileLocation(grp.location().filePath(),
                                        grp.location().line(), grp.location().column());
+            rpp.setBuildSystemTarget(uniqueProductName(prd));
 
             QHash<QString, qbs::ArtifactData> filePathToSourceArtifact;
             bool hasCFiles = false;