ChangeLog, ismounted.c:

ChangeLog, ismounted.c:
  ismounted.c (check_mntent_file): Use a test file in / to check to see
  	if the root filesystem is mounted read-only.  This protects against
  	the case where /etc might not be on /, as well as the case where
  	/etc/mtab doesn't exist.  (Both are should-never happen scenarios, but
  	you never know...)