"Indirect" calls to isSallCallFunction (for canonic and overridden
FunctionDecls) already needed to handle many cases of FunctionDecls spanning
macros, so it isn't that much more work to make that also work for cases called
directly from VisitFunctionDecl.
Reviewed-on: https://gerrit.libreoffice.org/46367Tested-by: Jenkins <firstname.lastname@example.org>
Reviewed-by: Stephan Bergmann <email@example.com>