Changeset f450ac9 in mod_gnutls for src/gnutls_ocsp.c

Replace mgs_session_id2sz() with apr_(p?)escape_hex()

There's no need to carry a local bin-to-hex function if APR already
provides a converter. Using integrated pool allocation even avoids a
few string copies in gnutls_hooks.c.

The session hex buffers in gnutls_cache.c don't need room for the
memcache tag because it is added in a apr_psprintf() call if
necessary, so we can save a few bytes of stack space there.