Make sure obj_xref.h is updated during a "make update"

Makefile.org

@@ -428,6 +428,8 @@ crypto/objects/obj_dat.h: crypto/objects/obj_dat.pl crypto/objects/obj_mac.h
 	$(PERL) crypto/objects/obj_dat.pl crypto/objects/obj_mac.h crypto/objects/obj_dat.h
 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
 
 apps/openssl-vms.cnf: apps/openssl.cnf
 	$(PERL) VMS/VMSify-conf.pl < apps/openssl.cnf > apps/openssl-vms.cnf
@@ -440,7 +442,7 @@ TABLE: Configure
 	(echo 'Output of `Configure TABLE'"':"; \
 	$(PERL) Configure TABLE) > TABLE
 
-update: errors stacks util/libeay.num util/ssleay.num crypto/objects/obj_dat.h apps/openssl-vms.cnf crypto/bn/bn_prime.h TABLE depend
+update: errors stacks util/libeay.num util/ssleay.num crypto/objects/obj_dat.h crypto/objects/obj_xref.h apps/openssl-vms.cnf crypto/bn/bn_prime.h TABLE depend
 
 # Build distribution tar-file. As the list of files returned by "find" is
 # pretty long, on several platforms a "too many arguments" error or similar