The FHS indicates that /etc must be capable of being mounted R/O.

The FHS also indicates that lock files belong in /var/lock, and /var must
be R/W as soon as possible during boot.

This patch moves the mtab lock file from the potentially R/O /etc, to the
R/W /var/lock area.  This lock file is used when mounting disks and making
other mount adjustments.  The _PATH_MOUNTED_TMP is not adjusted, as failing
to write to this file does not cause any functional limitations.

(Note, if /etc is R/O, then /etc/mtab should be a symlink to /proc/mounts)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

--- util-linux-ng-2.16/include/pathnames.h.orig
+++ util-linux-ng-2.16/include/pathnames.h
@@ -90,7 +90,7 @@
 # endif
 #endif
 
-#define _PATH_MOUNTED_LOCK	_PATH_MOUNTED "~"
+#define _PATH_MOUNTED_LOCK	"/var/lock/mtab~"
 #define _PATH_MOUNTED_TMP	_PATH_MOUNTED ".tmp"
 
 #ifndef _PATH_DEV