egl: Allow OpenGL ES 3.0 as a version

In the DRI2 back-end this will get the same API as GLES 2.0.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index c3068c3..423d18d 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -674,6 +674,7 @@
          api = __DRI_API_GLES;
          break;
       case 2:
+      case 3:
          api = __DRI_API_GLES2;
          break;
       default: