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Linux 3.0 introduced /sys/fs/selinux as the preferred mount point
directory for selinuxfs.  Upstream libselinux tries to mount selinuxfs
on /sys/fs/selinux first and falls back to /selinux if it doesn't exist.
Do likewise in Android.

Change-Id: Iec738ff7e2f13f809a271eb03f08ef6cd2582bd4
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>