Change directory build order. png needs to come before pngcom. This is finishing up pnunn last checkin.... Added png and zlib library link. pnunn. refer to Bug#5459. review:slamm. ok'd:chofmann.

modules/libimg/Makefile.in

@@ -22,12 +22,12 @@ VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS = public public_com src gifcom pngcom jpgcom
-
 ifndef MOZ_NATIVE_PNG
-DIRS += png
+DIRS = png
 endif
 
+DIRS += public public_com src gifcom pngcom jpgcom
+
 EXTRA_LIBS = $(PNG_LIBS) $(ZLIB_LIBS)
 
 include $(topsrcdir)/config/rules.mk