[gnome-build-meta/mcatanzaro/fdkaac] Update to freedesktop-sdk git master

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 1b39790ab8a466c17b64197a31cdb31dec70ff6a
Author: Michael Catanzaro <mcatanzaro posteo net>
Date:   Sat Jun 29 02:54:18 2019 +0000

    Update to freedesktop-sdk git master
    
    This is to test fixes for:
    
     * libfdk-aac audio screeching issue
     * gdb not able to process debuginfo

 junction.refs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/junction.refs b/junction.refs
index b12aab81..ef7ae497 100644
--- a/junction.refs
+++ b/junction.refs
@@ -1,4 +1,4 @@
 projects:
   gnome:
     freedesktop-sdk.bst:
-    - ref: freedesktop-sdk-19.08beta.0.1-7-geb38d225ec0bde6b075b0fde4734123176dcdbd9
+    - ref: freedesktop-sdk-19.08beta.0.1-40-g571e7a45aa225c5957b5d0203b47dbb668023c71