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
Merge commit 'dfdc0bac7771fadb2751db3972271d3dd1e3d049'
Update VS project files for recent merge.