Update REQUIRES so that we do not accidentally build using the system headers of jpeg,zlib,png,mng when we are supposed to be building using the Mozilla copies of these libraries.

Bug #97386 r=mcafee a=dbaron

layout/inspector/src/Makefile.in

@@ -28,7 +28,7 @@ include $(DEPTH)/config/autoconf.mk
 
 MODULE=inspector
 LIBRARY_NAME=inspector_s
-REQUIRES=xpcom string dom rdf rdfutil layout widget locale gfx2 necko docshell view timer imglib2 mimetype exthandler
+REQUIRES=xpcom string dom rdf rdfutil layout widget locale gfx2 necko docshell view timer imglib2 mimetype exthandler $(PNG_REQUIRES) $(ZLIB_REQUIRES)
 
 CPPSRCS= \
 	inDOMDataSource.cpp \