Merge topic 'sunos-i386-mkdtemp'

4db9e1009d Solaris: Backport our mkdtemp code paths to SunOS 5.10 i386
f189e64126 Tests: Add cases covering our mkdtemp code paths

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !10313