On svn-auth-x509 branch: followup to r1636386.

* subversion/libsvn_subr/x509.h
  (struct asn1_oid): Move to ...

* subversion/libsvn_subr/x509info.c
  (struct asn1_oid): ... here.
  (asn1_oids): Make array const.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/svn-auth-x509@1636388 13f79535-47bb-0310-9956-ffa450edef68