fate: Fix dependencies for ffprobe tests with external samples

Up until now, they were appended to the FATE_EXTERN-$(CONFIG_FFMPEG)
variable and were therefore activated when ffmpeg was enabled regardless
of whether ffprobe was enabled.

Also the same happened with FATE_SAMPLES_FASTSTART, although the
corresponding test (mov-faststart-4gb-overflow) only requires external
samples.

Furthermore, remove the unused FATE_FULL variable (FATE_EXTERN_FFPROBE has
taken its place).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

tests/Makefile

@@ -203,8 +203,9 @@ FATE-$(CONFIG_FFPROBE) += $(FATE_FFPROBE)
 
 FATE_SAMPLES_AVCONV           += $(FATE_SAMPLES_AVCONV-yes)
 FATE_SAMPLES_FFMPEG           += $(FATE_SAMPLES_FFMPEG-yes)
-FATE_EXTERN-$(CONFIG_FFMPEG)  += $(FATE_SAMPLES_AVCONV) $(FATE_SAMPLES_FFMPEG) $(FATE_SAMPLES_FFPROBE) $(FATE_SAMPLES_FASTSTART)
-FATE_EXTERN += $(FATE_EXTERN-yes)
+FATE_EXTERN-$(CONFIG_FFMPEG)  += $(FATE_SAMPLES_AVCONV) $(FATE_SAMPLES_FFMPEG)
+FATE_EXTERN-$(CONFIG_FFPROBE) += $(FATE_SAMPLES_FFPROBE)
+FATE_EXTERN                   += $(FATE_EXTERN-yes) $(FATE_SAMPLES_FASTSTART)
 
 FATE += $(FATE-yes)
 
@@ -218,7 +219,6 @@ $(FATE_FFPROBE) $(FATE_SAMPLES_FFPROBE): ffprobe$(PROGSSUF)$(EXESUF)
 $(FATE_SAMPLES_FASTSTART): tools/qt-faststart$(EXESUF)
 
 ifdef SAMPLES
-FATE += $(FATE_FULL) $(FATE_FULL-yes)
 FATE += $(FATE_EXTERN)
 fate-rsync:
 	rsync $(RSYNC_OPTIONS) rsync://fate-suite.ffmpeg.org/fate-suite/ $(SAMPLES)