fate: disable lavfi-histeq

The filter has been added recently and does not yet pass tests on all platforms.
It should not be included in the tests in the release until it works.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

tests/fate/avfilter.mak

@@ -41,7 +41,6 @@ FATE_LAVFI = fate-lavfi-alphaextract_rgb                                \
 
 FATE_LAVFI-$(CONFIG_GPL) += fate-lavfi-colormatrix1                     \
                             fate-lavfi-colormatrix2                     \
-                            fate-lavfi-histeq                           \
                             fate-lavfi-hue                              \
                             fate-lavfi-pixfmts_super2xsai               \
                             fate-lavfi-tinterlace_merge                 \