vrend, feature: Add feature for GLES 3.1 compatibility

This is needed for using the right extension in the shaders.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

src/vrend_renderer.c

@@ -110,6 +110,7 @@ enum features_id
    feat_gl_conditional_render,
    feat_gl_prim_restart,
    feat_gles_khr_robustness,
+   feat_gles31_compatibility,
    feat_gles31_vertex_attrib_binding,
    feat_gpu_shader5,
    feat_images,
@@ -190,6 +191,7 @@ static const  struct {
    FEAT(gl_conditional_render, 30, UNAVAIL, NULL),
    FEAT(gl_prim_restart, 31, 30, NULL),
    FEAT(gles_khr_robustness, UNAVAIL, UNAVAIL,  "GL_KHR_robustness" ),
+   FEAT(gles31_compatibility, 45, 31, "ARB_ES3_1_compatibility" ),
    FEAT(gles31_vertex_attrib_binding, 43, 31,  "GL_ARB_vertex_attrib_binding" ),
    FEAT(gpu_shader5, 40, 32, "GL_ARB_gpu_shader5", "GL_EXT_gpu_shader5", "GL_OES_gpu_shader5" ),
    FEAT(images, 42, 31,  "GL_ARB_shader_image_load_store" ),