i965: Add missing stdio.h include to brw_compiler.h.

i965: Add missing stdio.h include to brw_compiler.h.

This is needed for the FILE * type in brw_print_vue_map().

Apparently, all files that include brw_compiler.h already pick this up
via some include chain, so this isn't actually a build fix.  However,
I have patches which introduce new consumers of brw_compiler.h that
fail to build because of the missing #include.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>