RFR: 8u: 8076475: Misuses of strncpy/strncat

[Andrew Haley]

http://cr.openjdk.java.net/~aph/8076475-8u/

Original bug: https://bugs.openjdk.java.net/browse/JDK-8076475
Original patch: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/4cf3113c8f42

In a couple of places the original patch didn't apply because the code
being patched was not there yet. Other places required some minor
adjustments.

OK, I'll be honest, I'm not completely convinced that this is really a
suitable patch to be backported to stable 8u. Maybe as a maintainer
I'll reject it. But I've done it now, so I'd be grateful for a review.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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