Rename servertest target to ffservertest.

Originally committed as revision 18242 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -277,7 +277,7 @@ $(LAVF_TESTS):
 seektest: codectest lavftest tests/seek_test$(EXESUF)
 	$(SRC_PATH)/tests/seek-regression.sh $(SEEK_REFFILE) "$(TARGET_EXEC)" "$(TARGET_PATH)"
 
-servertest: ffserver$(EXESUF) tests/vsynth1/00.pgm tests/asynth1.sw
+ffservertest: ffserver$(EXESUF) tests/vsynth1/00.pgm tests/asynth1.sw
 	@echo
 	@echo "Unfortunately ffserver is broken and therefore its regression"
 	@echo "test fails randomly. Treat the results accordingly."