[Bug c/68162] [5/6 Regression] Incompatible pointer type using a typedef

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68162

--- Comment #3 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Created attachment 36648
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36648&action=edit
Minimal patch for grokdeclarator