Install static libpostproc if CONFIG_PP is set.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@4976 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/Makefile

@@ -525,6 +525,9 @@ endif
 
 installlib: all install-headers
 	install -m 644 $(LIB) "$(libdir)"
+ifeq ($(CONFIG_PP),yes)
+	$(MAKE) -C libpostproc $@
+endif
 
 install-headers:
 	mkdir -p "$(prefix)/include/ffmpeg"