fix codec_ilbc.so build - it would build before, but libilbc.a was not linked

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@9732 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/Makefile

@@ -89,7 +89,7 @@ $(LIBLPC10):
 $(LIBILBC):
 	$(MAKE) -C ilbc all
 
-$(MODILBC): codec_ilbc.o $(LIBILBC)
+codec_ilbc.so: codec_ilbc.o $(LIBILBC)
 	$(CC) $(SOLINK) -o $@ ${CYGSOLINK} $< ${CYGSOLIB} $(LIBILBC)
 
 codec_g723_1.so : codec_g723_1.o $(LIBG723)