Bug#847366: gtk apps die with 'Couldn't open libGL.so.1'

[Dariusz Gadomski]

I have added prepared and checked that it actually fixes this issue.

diff -Nru gtk+3.0-3.22.6/debian/changelog gtk+3.0-3.22.6/debian/changelog
--- gtk+3.0-3.22.6/debian/changelog     2017-01-09 15:55:17.000000000 +0100
+++ gtk+3.0-3.22.6/debian/changelog     2017-01-17 11:19:18.000000000 +0100
@@ -1,3 +1,9 @@
+gtk+3.0 (3.22.6-2) unstable; urgency=medium
+
+  * Add libgl1 to dependencies. (Closes: #847366)
+
+ -- Dariusz Gadomski <dariusz.gadom...@canonical.com>  Tue, 17 Jan 2017 
11:19:18 +0100
+
 gtk+3.0 (3.22.6-1) unstable; urgency=medium
 
   [ Jeremy Bicha ]
diff -Nru gtk+3.0-3.22.6/debian/control gtk+3.0-3.22.6/debian/control
--- gtk+3.0-3.22.6/debian/control       2017-01-09 15:55:17.000000000 +0100
+++ gtk+3.0-3.22.6/debian/control       2017-01-17 11:19:18.000000000 +0100
@@ -67,7 +67,8 @@
          ${shlibs:Depends},
          hicolor-icon-theme,
          adwaita-icon-theme,
-         shared-mime-info
+         shared-mime-info,
+         libgl1
 Provides: gtk3-binver-3.0.0
 Recommends: libgtk-3-bin
 Suggests: librsvg2-common,