i965: Don't link libmesa or libdri_test_stubs into tests

i965: Don't link libmesa or libdri_test_stubs into tests

Now that the compiler has been completely separated from libmesa, we no
longer need these.  We can make the tests much smaller by not linking them
in.  This also ensures that anyone who runs make check won't accidentally
put in any dependencies from the compiler to the rest of mesa core.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>