[gnome-build-meta/tpollard/raspi4] Revert GDM element to known working state & ref

[Tom Pollard <tpollard src gnome org>]

commit 085d0d6822a5f13d170542b98582d9ffc8357878
Author: Tom Pollard <tom pollard codethink co uk>
Date:   Tue May 12 10:06:22 2020 +0100

    Revert GDM element to known working state & ref

 elements/core/gdm.bst | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)
---
diff --git a/elements/core/gdm.bst b/elements/core/gdm.bst
index b857b3ea..de4d1975 100644
--- a/elements/core/gdm.bst
+++ b/elements/core/gdm.bst
@@ -1,13 +1,13 @@
-kind: meson
+kind: autotools
 sources:
 - kind: git_tag
   url: gitlab_gnome_org:GNOME/gdm.git
-  track: master
+  track: 3.34.1-20-g2090685406c775d734d57b40f84bd0876a9e829e
 - kind: local
   path: files/gdm
   directory: gdm-config
 build-depends:
-- freedesktop-sdk.bst:public-stacks/buildsystem-meson.bst
+- freedesktop-sdk.bst:public-stacks/buildsystem-autotools.bst
 depends:
 - core-deps/accountsservice.bst
 - core-deps/upower.bst
@@ -21,14 +21,11 @@ depends:
 variables:
   sysusersdir: '%{prefix}/lib/sysusers.d'
   pamdir: '%{sysconfdir}/pam.d'
-  meson-local: >-
-    -Ddefault-pam-config=none
-    -Dlibaudit=disabled
-    -Dpam-prefix=%{sysconfdir}
-    -Dplymouth=enabled
-    -Drun-dir=/run/gdm
-    -Dselinux=disabled
-    -Dxdmcp=disabled
+  conf-local: >-
+    --enable-wayland-support
+    --with-pam-prefix=%{sysconfdir}
+    --with-run-dir=/run/gdm
+    --with-plymouth=yes
 
 config:
   install-commands:
@@ -36,7 +33,7 @@ config:
     - mkdir -p %{install-root}%{sysusersdir}
     - install -m 644 gdm-config/gdm-sysusers.conf %{install-root}%{sysusersdir}/gdm.conf
 
-    - mkdir -p %{install-root}%{pamdir}
+    - mkdir -p %{pamdir}
     - |
       # Our configuration is similar to redhat but without selinux
       for conffile in `find gdm-config/ -name "*.pam"`; do