[gnome-sdk-images/gnome-3-26] Remove gstreamer 1.10 plugins before building 1.12

[Alexander Larsson <alexl src gnome org>]

commit 2b1dc1b1ad84bddc932da2395a96d5a7e4c4fad0
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Sep 18 11:58:30 2017 +0200

    Remove gstreamer 1.10 plugins before building 1.12

 org.gnome.Sdk.json.in |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 2a528bb..0496bfd 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -306,6 +306,10 @@
                      "url": "https://gstreamer.freedesktop.org/src/gstreamer/gstreamer-1.12.2.tar.xz";,
                      "sha256": "9fde3f39a2ea984f9e07ce09250285ce91f6e3619d186889f75b5154ecf994ba"
                  }
+            ],
+            "build-commands": [
+                /* We delete all the 1.10 plugins to avoid version mismatches with renamed or removed 
plugins */
+                "rm -rf /usr/lib/gstreamer-1.0"
             ]
         },
         {