lavfi: rename asrc_aevalsrc.c to aeval.c

The file now contains both source and filter, the new name looks more
appropriate.

libavfilter/Makefile

@@ -53,7 +53,7 @@ OBJS-$(CONFIG_AVCODEC)                       += avcodec.o
 OBJS-$(CONFIG_ACONVERT_FILTER)               += af_aconvert.o
 OBJS-$(CONFIG_ADELAY_FILTER)                 += af_adelay.o
 OBJS-$(CONFIG_AECHO_FILTER)                  += af_aecho.o
-OBJS-$(CONFIG_AEVAL_FILTER)                  += asrc_aevalsrc.o
+OBJS-$(CONFIG_AEVAL_FILTER)                  += aeval.o
 OBJS-$(CONFIG_AFADE_FILTER)                  += af_afade.o
 OBJS-$(CONFIG_AFORMAT_FILTER)                += af_aformat.o
 OBJS-$(CONFIG_AINTERLEAVE_FILTER)            += f_interleave.o
@@ -101,7 +101,7 @@ OBJS-$(CONFIG_TREBLE_FILTER)                 += af_biquads.o
 OBJS-$(CONFIG_VOLUME_FILTER)                 += af_volume.o
 OBJS-$(CONFIG_VOLUMEDETECT_FILTER)           += af_volumedetect.o
 
-OBJS-$(CONFIG_AEVALSRC_FILTER)               += asrc_aevalsrc.o
+OBJS-$(CONFIG_AEVALSRC_FILTER)               += aeval.o
 OBJS-$(CONFIG_ANULLSRC_FILTER)               += asrc_anullsrc.o
 OBJS-$(CONFIG_FLITE_FILTER)                  += asrc_flite.o
 OBJS-$(CONFIG_SINE_FILTER)                   += asrc_sine.o