-std=gnu99 fixes

[Marcus Brinkmann]

Hi,

I tested moving -std=gnu99 to CFLAGS rather than CPPFLAGS and it works just
fine, so I committed the changes.  I also removed the (spinlock_t) in the
compound literal, so that it is recognized as a constant by gcc.

This fixes the -std=gnu99 compile for me.

Thanks,
Marcus

-- 
`Rhubarb is no Egyptian god.' GNU      http://www.gnu.org    marcus@gnu.org
Marcus Brinkmann              The Hurd http://www.gnu.org/software/hurd/
Marcus.Brinkmann@ruhr-uni-bochum.de
http://www.marcus-brinkmann.de/