i965/blorp: Make state setup C-safe

i965/blorp: Make state setup C-safe

Previously they (very rarely) used C++isms that prevented them from being
compiled as C.  As of this commit, they can be compiled as either C or C++.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>