warning: #import is a deprecated GCC extension

[Jack Howarth]

  The darwin-specific gcc.dg/cpp/subframework1.c -fno-show-column test case
is failing under gcc trunk for the excessive errors test because we now
get warnings...

warning: #import is a deprecated GCC extension

Is there a particular way to modify an excessive errors test case to 
have a particular warning like this be ignored? Thanks in advance for
any hints on solving this issue.
         Jack
ps This is PR38098.