Clang: Fix naming conventions for *ModelManagerSupport* classes

We use "Builtin" and "Clang" as prefixes, not suffixes.

Change-Id: I6926aeb8f005176ef420c4421c257e3df61ee0b7
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/cpptools/cpptools.qbs

@@ -56,6 +56,8 @@ Project {
             "clazychecks.ui",
             "compileroptionsbuilder.cpp",
             "compileroptionsbuilder.h",
+            "cppbuiltinmodelmanagersupport.cpp",
+            "cppbuiltinmodelmanagersupport.h",
             "cppcanonicalsymbol.cpp",
             "cppcanonicalsymbol.h",
             "cppchecksymbols.cpp",
@@ -123,8 +125,6 @@ Project {
             "cppmodelmanager.h",
             "cppmodelmanagersupport.cpp",
             "cppmodelmanagersupport.h",
-            "cppmodelmanagersupportinternal.cpp",
-            "cppmodelmanagersupportinternal.h",
             "cppoverviewmodel.cpp",
             "cppoverviewmodel.h",
             "cpppointerdeclarationformatter.cpp",
@@ -215,7 +215,7 @@ Project {
             "tidychecks.ui",
             "typehierarchybuilder.cpp",
             "typehierarchybuilder.h",
-            "usages.h"
+            "usages.h",
         ]
 
         Group {