package/ci: temporarily disable GLES3 build on Linux.
package/ci: temporarily disable GLES3 build on Linux.

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

MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum