CppParser: fix compile warnings

Fix trivial switch/case compile warnings like the one below by adding
default case.

enumerator 'LastPreprocessingDirective' in switch of enum 'clang::PreprocessedEntity::EntityKind' is not handled

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
Parser: fix compile warnings

Fix trivial switch/case compile warnings like the one below by adding
default case.

enumerator 'LastPreprocessingDirective' in switch of enum 'clang::PreprocessedEntity::EntityKind' is not handled

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>