fix Makefile: remove ilpack

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/Makefile

@@ -229,7 +229,6 @@ OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/mp_image.o
 OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/img_format.o
 OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/vf_eq2.o
 OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/vf_eq.o
-OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/vf_ilpack.o
 OBJS-$(CONFIG_MP_FILTER) += libmpcodecs/vf_softpulldown.o
 
 # multimedia filters