base-files: chmod 1777 /var/lock

base-files: chmod 1777 /var/lock

Per FHS 3.0, /var/lock is the location for lock files [1].
However its current permissions (755) are too restrictive
for use by unprivileged processes.
Debian and Ubuntu set them to 1777, and now so do we.

[1] <https://refspecs.linuxfoundation.org/FHS_3.0/fhs-3.0.html#varlockLockFiles>

Signed-off-by: Deomid Ryabkov <rojer@rojer.me>
[fixed typo in commit message, had to remove "rojer" due to git hooks]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>