[ob] Eliminate another gdb_suppress_entire_file

[Joel Brobecker]

> There's a few versions of GCC 4.1 which can't compile gdb.base/store.c. It
> was eventually fixed on the release branch, but I happen to be testing a
> version where it's broken.  I've been making this change globally as the
> function in question pops up to bite me.

Should we try to remove all the instances of gdb_suppress_entire_file?
I don't remember if there are some cases where it's legit to use them.

Thanks,
-- 
Joel