Add pcxenc.o to the $OBJS list, it was erroneously removed from it in

r18164.
Fix compilation.

Originally committed as revision 18168 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -161,6 +161,7 @@ OBJS-$(CONFIG_PAM_ENCODER)             += pnmenc.o
 OBJS-$(CONFIG_PBM_DECODER)             += pnmenc.o pnm.o
 OBJS-$(CONFIG_PBM_ENCODER)             += pnmenc.o
 OBJS-$(CONFIG_PCX_DECODER)             += pcx.o
+OBJS-$(CONFIG_PCX_ENCODER)             += pcxenc.o
 OBJS-$(CONFIG_PGM_DECODER)             += pnmenc.o pnm.o
 OBJS-$(CONFIG_PGM_ENCODER)             += pnmenc.o
 OBJS-$(CONFIG_PGMYUV_DECODER)          += pnmenc.o pnm.o