lavfi: rename vsrc_movie.c to src_movie.c

The file is going to contain the amovie source, so give it a less
specific name.

libavfilter/Makefile

@@ -74,7 +74,7 @@ OBJS-$(CONFIG_YADIF_FILTER)                  += vf_yadif.o
 OBJS-$(CONFIG_BUFFER_FILTER)                 += vsrc_buffer.o
 OBJS-$(CONFIG_COLOR_FILTER)                  += vsrc_color.o
 OBJS-$(CONFIG_FREI0R_SRC_FILTER)             += vf_frei0r.o
-OBJS-$(CONFIG_MOVIE_FILTER)                  += vsrc_movie.o
+OBJS-$(CONFIG_MOVIE_FILTER)                  += src_movie.o
 OBJS-$(CONFIG_MPTESTSRC_FILTER)              += vsrc_mptestsrc.o
 OBJS-$(CONFIG_NULLSRC_FILTER)                += vsrc_nullsrc.o
 OBJS-$(CONFIG_RGBTESTSRC_FILTER)             += vsrc_testsrc.o