K 10
svn:author
V 6
eadler
K 8
svn:date
V 27
2012-11-04T15:15:47.069718Z
K 7
svn:log
V 264
Make OK_TO_WRITE_TO_DISK an envrionment variable instead
of a compile time option.

While here, don't differ based on the existence of LOCK_EX
which doesn't seem to have ever made a difference on FreeBSD.

Approved by:	cperciva (from discussion)
MFC after:	3 days

END