This is the *real* fix for the Linux bustage. Sorry about this loss of time.

Had to do with MOZ_NATIVE_ZLIB not being defined on my system (differs from
the tbox builds I guess).

modules/libjar/standalone/Makefile.in

@@ -41,7 +41,7 @@ CPPSRCS		= \
 override NO_SHARED_LIB=1
 override NO_STATIC_LIB=
 
-SHARED_LIBRARY_LIBS = $(DIST)/lib/libzlib.a
+SHARED_LIBRARY_LIBS = $(DIST)/lib/libzlib_s.a
 
 include $(topsrcdir)/config/rules.mk