PATCH: tweak spec file for spu-elf

[Andrew Pinski]

> 
> The spu-elf target has no libc_p.a, so don't try to link with it when
> compiling with -p or -pg.  Tested with a full spu-elf build.
> 
> OK for trunk?

Yes this is OK.

Just a note for other people, I have a fix for f951 building failing
but after fixing that bug, I run into PR 29945 which I have a patch now.
Both needs to be tested which I am going to do this holiday.

Thanks,
Andrew Pinski