[x265] getopt_long() lets through ambiguous arguments like --nr

[Joshua Bowman]

GNU getopt allows abbreviated options, but it really SHOULD blow up when an
argument short-matches a name twice; instead it just merrily takes the
first one. It seems to be designed to allow a developer to brain fart and
insert the exact same argument twice without error, and this patch will
still allow that, but it WILL prevent something like --nr that matches both
--nr-intra and --nr-inter from just silently using the first match. For
some reason, no one ever thought to compare the actual argument names.

This doesn't patch the -W path. No one cares about POSIX -W.
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