[Bug preprocessor/60570] expression in 'elif' directive mis-diagnosed as error when group will be skipped

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60570

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
-#elif   /* { dg-error "with no expression" } */
+#elif

Perhaps turn it into dg-bogus instead?