use wait and retransmit when receiving session tickets
doc update
doc update
rnd: if RUSAGE_THREAD fails try RUSAGE_SELF
doc update
placed all rusage variables into HAVE_GETRUSAGE block
updated to libopts 5.18.4
doc update
bumped version
simplified getrusage code; the failure check code wasn't needed
corrected the SSSE3 optimized SHA224
corrected libopt's Makefile.am

reported by Marius Schamschula.
guile: Remove trailing zero in 'gnutls_server_name_set' call.

In GnuTLS 3.2.19 (and possibly 3.3.9 and 3.1.17),
'set-session-server-name!' would pass a trailing nul character on the
wire after the server name, which would thus be rejected by servers.
do not explicitly refresh rnd state on session deinit

It is already being refreshed during the session lifetime.
doc update
when exporting curve coordinates to X9.63 format, perform additional sanity checks on input

Reported by Sean Burford.
doc update
bumped version
testcompat: updated
treat GNUTLS_E_GOT_APPLICATION_DATA as non-fatal if initial negotiation is complete

This corrects a regression introduced in b5a0de2e6da98866cafb770c3141b7353d030ab2
Reported by Dan Winship. https://savannah.gnu.org/support/?108690