fate: libavutil tests do not require SAMPLES.

tests/Makefile

@@ -93,6 +93,7 @@ FATE_SEEK    = $(SEEK_TESTS:seek_%=fate-seek-%)
 FATE = $(FATE_ACODEC)                                                   \
        $(FATE_VCODEC)                                                   \
        $(FATE_LAVF)                                                     \
+       $(FATE_LIBAVUTIL)                                                \
        $(FATE_SEEK)                                                     \
 
 FATE-$(CONFIG_AVFILTER) += $(FATE_LAVFI)

tests/fate/libavutil.mak

@@ -41,5 +41,4 @@ FATE_LIBAVUTIL += fate-sha
 fate-sha: libavutil/sha-test$(EXESUF)
 fate-sha: CMD = run libavutil/sha-test
 
-FATE_TESTS += $(FATE_LIBAVUTIL)
 fate-libavutil: $(FATE_LIBAVUTIL)