Merge branch 'vendor/OPENPAM'

Import OpenPAM Resedacea.

See HISTORY for the details.

Fix gcc80 -Wnonnull-compare.

For arguments that are checked against NULL in the function, we don't
want a nonnull attribute, because that will cause the NULL check to be
optimized away in higher -O

Fix gcc80 -Wnonnull-compare.

For arguments that are checked against NULL in the function, we don't
want a nonnull attribute, because that will cause the NULL check to be
optimized away in higher -O levels and it will also trigger a
-Wnonnull-compare warning.

See also 0f037c78525bfb7df49de8338826e15137859b1d commit message.

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Import OpenPAM Lycopsida.

This also includes changeset 509 to prevent a logged error message if
the file doesn't exist in openpam_check_owner_perms.c.

Import OpenPAM Hydrangea.

Import OpenPAM Figwort.