Rename aac.c to aacdec.c.

Originally committed as revision 23489 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -42,7 +42,7 @@ OBJS-$(CONFIG_VAAPI)                   += vaapi.o
 OBJS-$(CONFIG_VDPAU)                   += vdpau.o
 
 # decoders/encoders/hardware accelerators
-OBJS-$(CONFIG_AAC_DECODER)             += aac.o aactab.o aacsbr.o
+OBJS-$(CONFIG_AAC_DECODER)             += aacdec.o aactab.o aacsbr.o
 OBJS-$(CONFIG_AAC_ENCODER)             += aacenc.o aaccoder.o    \
                                           aacpsy.o aactab.o      \
                                           psymodel.o iirfilter.o \