linux-core support broke i386 compilation

[Michael Snyder]

Daniel Jacobowitz wrote:
> 
> You reference a type 'gdb_fpxregset_t'.  It doesn't appear to be defined
> anywhere.
> 
> I'm also not sure that that's the right #ifdef for the check; PowerPC was
> sounding like it would have an fpxregset (well, an xregset, really - no FP
> involved) but without PTRACE_GETFPXREGS.  fill_fpxregset also appears to
> lack a prototype.

Nuts!  Forgot a file.  Comes from having too many outstanding patches in 
my source directory.

Fix checked in, PATCH posting coming.