CppTools: Fix qbs build.

Change-Id: Iab88214089c48e73c9dbc4e0b0cfded734e0be13
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/cpptools/cpptools.qbs

@@ -76,6 +76,8 @@ QtcPlugin {
         "cppqtstyleindenter.h",
         "cpppointerdeclarationformatter.cpp",
         "cpppointerdeclarationformatter.h",
+        "cppprojectfile.cpp",
+        "cppprojectfile.h",
         "cpprefactoringchanges.cpp",
         "cpprefactoringchanges.h",
         "cppsemanticinfo.cpp",