Add error checking to obj_xref.pl and add command line support for data
file locations.

Makefile.org

diff --git a/Makefile.org b/Makefile.org
index 580a269..21d194e 100644
--- a/Makefile.org
+++ b/Makefile.org
@@ -438,7 +438,7 @@
 crypto/objects/obj_mac.h: crypto/objects/objects.pl crypto/objects/objects.txt crypto/objects/obj_mac.num
 	$(PERL) crypto/objects/objects.pl crypto/objects/objects.txt crypto/objects/obj_mac.num crypto/objects/obj_mac.h
 crypto/objects/obj_xref.h: crypto/objects/objxref.pl crypto/objects/obj_xref.txt crypto/objects/obj_mac.num
-	$(PERL) crypto/objects/objxref.pl > crypto/objects/obj_xref.h
+	$(PERL) crypto/objects/objxref.pl crypto/objects/obj_mac.num crypto/objects/obj_xref.txt >crypto/objects/obj_xref.h
 
 apps/openssl-vms.cnf: apps/openssl.cnf
 	$(PERL) VMS/VMSify-conf.pl < apps/openssl.cnf > apps/openssl-vms.cnf