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

[mpolacek at gcc dot gnu.org]

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

--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
dg-bogus is better, yet.  FWIW, the patch has been successfully
regtested/bootstrapped now.