since Michael prefers to keep dsputil.h private to libavcodec

(rather than installing it system-wide) this patch reverses the
mistake I made last month (mplayer was recently fixed accordingly).

patch from Nico Sabbi <nicola_sabbi at fastwebnet it>

Originally committed as revision 5186 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -18,7 +18,7 @@ OBJS= bitstream.o utils.o mem.o allcodecs.o \
       vp3dsp.o h264idct.o rangecoder.o pnm.o h263.o msmpeg4.o h263dec.o \
       opt.o
 
-HEADERS = avcodec.h dsputil.h
+HEADERS = avcodec.h
 
 ifeq ($(CONFIG_AASC_DECODER),yes)
     OBJS+= aasc.o