QtSupport: Remove dependency on CppTools

It was only left for the C++ category for the Qt class generation
settings.

Change-Id: I22d3f198f7b825c4a36d08d4ee28091b9e5b1f43
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/cpptools.qbs

@@ -153,7 +153,6 @@ Project {
             "cppsemanticinfoupdater.h",
             "cppsourceprocessor.cpp",
             "cppsourceprocessor.h",
-            "cpptools.qrc",
             "cpptools_clangtidychecks.h",
             "cpptools_clazychecks.h",
             "cpptools_global.h",