i965: Do not set bilinear_filter flag in case of multisample blits

i965: Do not set bilinear_filter flag in case of multisample blits

Setting bilinear_filter flag in case of multisample blits with
GL_LINEAR filter causes incorrect behavior in translate_dst_to_src()
function. This broke Modern Warfare (1, 2 and 3) on SNB, IVB and HSW.

Tested on SNB and IVB, no Piglit regressions. Trace file of the game
(taken with apitrace) works fine with this patch.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=69078
Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reported-by: Armin K <krejzi@email.com>
Tested-by: Armin K <krejzi@email.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>