package/ci: temporarily disable GLES3 build on Linux.

The drivers on Ubuntu 12.04 are just too old and they miss some
required entrypoints.

package/ci/travis.yml

@@ -16,12 +16,14 @@ matrix:
     - TARGET=desktop-gles
     - TARGET_GLES2=ON
     - JOBS_LIMIT=4
-  - os: linux
-    compiler: gcc
-    env:
-    - TARGET=desktop-gles
-    - TARGET_GLES2=OFF
-    - JOBS_LIMIT=4
+  # Disabled because the Ubuntu 12.04 drivers are missing some ES3 entrypoints
+  # Should be enabled after moving to 14.04
+  #- os: linux
+    #compiler: gcc
+    #env:
+    #- TARGET=desktop-gles
+    #- TARGET_GLES2=OFF
+    #- JOBS_LIMIT=4
   - os: osx
     compiler: clang
     env: TARGET=desktop