Move away from deprecated PackageManager to the productbuild generator.

Author: WardF

CMakeInstallation.cmake

@@ -104,7 +104,7 @@ ENDIF()
 
 IF(APPLE)
   SET(CPACK_SOURCE_GENERATOR "TGZ")
-  SET(CPACK_GENERATOR "PackageMaker" "STGZ" "TBZ2" "TGZ" "ZIP")
+  SET(CPACK_GENERATOR "productbuild" "STGZ" "TBZ2" "TGZ" "ZIP")
 ENDIF()
 
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