Обсуждение: pgsql: Put #ifdef NOT_USED around posix_fadvise call.

Log Message:
-----------
Put #ifdef NOT_USED around posix_fadvise call.  We may want to resurrect
this someday, but right now it seems that posix_fadvise is immature to
the point of being broken on many platforms ... and we don't have any
benchmark evidence proving it's worth spending time on.

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.241 -> r1.242)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c.diff?r1=1.241&r2=1.242)