We are patching GDM to respect GDM_SESSIONS_DIR environment
variable, which we are setting in the GDM module. Previously, we
only took care of a single code path, the one that handled session
start-up; missing the one obtaining the list of sessions.

This commit patches the second code path, and also whitelists the
GDM_SESSIONS_DIR so that it can be passed to the greeter.

Fixes #34101

Unlike on linux these are not namespaced per user so this will cause
build failures if /tmp/nix-test was not removed by a previous build if
the nixbld user id doesn't match by accident. Nix already creates a
unique tempdir for builds so we can use that instead.

Fixes #44172

(cherry picked from commit 77a9745)

gnome3.gdm: fix session chooser (backport to 18.03)

This patchset contains patches against:

* CVE-2018-10998
* CVE-2018-11531
* CVE-2018-12264
* CVE-2018-12265

Also adding GPL2 license.

Re #43716 (add missing licenses)

Re #44458 (vulnerability roundup 46 - 18.03)

(cherry picked from commit 18e0d4f711f9ed3483c18efa498b1592c5f9c3f6)

(cherry picked from commit 1571c1f6631daaeae7db43983500ba3412ab6080)

Changelog: https://secure.php.net/ChangeLog-7.php#7.0.31

Changelog: https://secure.php.net/ChangeLog-5.php#5.6.37

php: 5.6.36 -> 5.6.37, 7.0.30 -> 7.0.31