Get rid of the DEFS variable. The only thing this was used for was to

pass -DHAVE_CONFIG_H to CC, and that symbol isn't used any more.

Makefile.pre.in

@@ -54,9 +54,8 @@ MAKESETUP=      $(srcdir)/Modules/makesetup
 
 # Compiler options
 OPT=		@OPT@
-DEFS=		@DEFS@
 CFLAGS=		$(OPT)
-CPPFLAGS=	-I. -I$(srcdir)/Include $(DEFS)
+CPPFLAGS=	-I. -I$(srcdir)/Include
 LDFLAGS=	@LDFLAGS@
 LDLAST=		@LDLAST@
 SGI_ABI=	@SGI_ABI@