[gnome-build-meta/mcatanzaro/proxymech.conf] sdk/gssproxy.bst: add workaround for 0 mtime

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5fa674ccd6ee8bc63be46285c7b3569d3e3e3c4e
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Wed May 18 17:01:43 2022 -0500

    sdk/gssproxy.bst: add workaround for 0 mtime
    
    We need to move proxymech.conf out of /etc so that it is part of the
    image, since ostree-overlaid stuff gets 0 mtime. It won't be loaded if
    the mtime is not as expected.
    
    Hopefully fixes #503

 elements/sdk/gssproxy.bst | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/elements/sdk/gssproxy.bst b/elements/sdk/gssproxy.bst
index b635b5ecd..11f650d79 100644
--- a/elements/sdk/gssproxy.bst
+++ b/elements/sdk/gssproxy.bst
@@ -19,3 +19,13 @@ variables:
     --enable-only-gss-module
     --with-gpp-default-behavior=REMOTE_FIRST
     --with-manpages=no
+
+# We have a nonstandard install location for proxymech.conf so that it works
+# under ostree. See gnome-build-meta#503.
+config:
+  install-commands:
+    (>):
+    - mkdir -p %{install-root}%{indep-libdir}/gss/mech.d
+    - mv %{install-root}%{sysconfdir}/gss/mech.d/proxymech.conf %{install-root}%{indep-libdir}/gss/mech.d/
+    - rmdir %{install-root}%{sysconfdir}/gss/mech.d/
+    - ln -s %{install-root}%{indep-libdir}/gss/mech.d/ %{install-root}%{sysconfdir}/gss/