Add -nn for .cpp MOC preprocessing for INTEGRITY

qmake generates .gpj project files for INTEGRITY.
Calls to moc on headers or code that do not produce actual output cause
a Note to be generated. This is considered as an error during build by
the Green Hills gbuild build tool.
-nn can be added to not generate that note when no output is generated.
This was already done for headers in util/integrity/qt.bod, but it was
not there yet for .cpp files.

Merge-request: 2693
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
(cherry picked from commit 480b2f4c79160afaac7934936d3ae6ea382ae2bb)
Change-Id: I480b2f4c79160afaac7934936d3ae6ea382ae2bb

qmake/generators/integrity/gbuild.cpp

@@ -398,6 +398,7 @@ QString GBuildMakefileGenerator::writeOne(QString filename, QString pathtoremove
             filepath.remove(0, 1);
         }
         s += "\n\t:preexecShellSafe='${QT_BUILD_DIR}/bin/moc ";
+        s += "-nn ";
         s += varGlue("DEFINES", "-D", " -D", " ");
         s += varGlue("INCLUDEPATH", "-I", " -I", " ");
         s += filepath;