Fix sendmail improper close-on-exec flag handling. [SA-14:11]

Fix incorrect error handling in PAM policy parser. [SA-14:13]

Fix triple-fault when executing from a threaded process. [EN-14:06]

Approved by:	so
Merge branch 'releng/10.0' of https://github.com/freebsd/freebsd into releng/10.0

This adds the recent SA's 14:11-14:13 and EN 14:06

Conflicts:
	sys/conf/newvers.sh