vf_settb: rename to settb

An audio version of settb (asettb) will be added to this file.
Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavfilter/Makefile

@@ -76,7 +76,7 @@ OBJS-$(CONFIG_SELECT_FILTER)                 += vf_select.o
 OBJS-$(CONFIG_SETDAR_FILTER)                 += vf_aspect.o
 OBJS-$(CONFIG_SETPTS_FILTER)                 += setpts.o
 OBJS-$(CONFIG_SETSAR_FILTER)                 += vf_aspect.o
-OBJS-$(CONFIG_SETTB_FILTER)                  += vf_settb.o
+OBJS-$(CONFIG_SETTB_FILTER)                  += settb.o
 OBJS-$(CONFIG_SHOWINFO_FILTER)               += vf_showinfo.o
 OBJS-$(CONFIG_SHUFFLEPLANES_FILTER)          += vf_shuffleplanes.o
 OBJS-$(CONFIG_SPLIT_FILTER)                  += split.o