[gnome-build-meta] Upgrade freedesktop-sdk and switch to sidebranch

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b07ef788e8efc62f673a95d6a8c47ec43d51ad33
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed May 16 08:09:34 2018 -0500

    Upgrade freedesktop-sdk and switch to sidebranch
    
    We require the ability to make immediate fixes to the freedesktop SDK,
    so following the master branch is not currently suitable for us. Use a
    sidebranch instead. It's current git master, plus one commit to upgrade
    GCC to make WebKit trunk buildable.
    
    In the future, we can reconsider whether having our own branch is
    needed, but I expect this is going to be required at least on release
    days as the release manager needs the ability to make immediate changes
    throughout the entirety of the stack.
    
    This additionally fixes #35, so that our CI will have a chance to
    succeed once again, and hopefully fixes #30.

 elements/freedesktop-sdk.bst | 2 +-
 junction.refs                | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/elements/freedesktop-sdk.bst b/elements/freedesktop-sdk.bst
index ad0a26d..95059ac 100644
--- a/elements/freedesktop-sdk.bst
+++ b/elements/freedesktop-sdk.bst
@@ -2,7 +2,7 @@ kind: junction
 sources:
 - kind: git
   url: https://gitlab.com/freedesktop-sdk/freedesktop-sdk/
-  track: master
+  track: gnome
 config:
   options:
     target_arch: '%{arch}'
diff --git a/junction.refs b/junction.refs
index 86a4217..c7e14c8 100644
--- a/junction.refs
+++ b/junction.refs
@@ -1,4 +1,4 @@
 projects:
   gnome:
     freedesktop-sdk.bst:
-    - ref: 08951cbce5152f53c7755279935a1147e4b923b5
+    - ref: 08d082523eb1560207c511c20cd910c710a41bf6