introduced when pam_getenv() was (needlessly) rewritten as part of
r913. Rewrite pam_getenv() again (but correctly, this time) to reduce
the number of times we iterate over the same string. Add a few unit
tests for pam_{get,put,set}env(), including one which would have
caught the bug.
Credit goes to Tim Creech <tcreech@tcreech.com> for discovering and
reporting the bug.
git-svn-id: svn+ssh://svn.openpam.org/svn/openpam/trunk@943 185d5e19-27fe-0310-9dcf-9bff6b9f3609
Dag-Erling Smørgrav