Use mkstemps(3) instead of tempnam(3).

Andrej Shadurarequested to merge
andrewsh/mkstemps into master

tempnam(3) is insecure, not recommended to be used, marked as obsolete in POSIX.1-2008. In fact, pseudo(1) fakeroot replacement for OpenEmbedded, blocks the use of tempnam(3) and tmpnam(3) hardcoding them to return ENOMEM.

Reimplement tempfile using mkstemps(3), performing directory selection according to tempfile's manual page.

Update the manpage accordingly.

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