mesa/es: Add support for GL_OES_draw_texture.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>

src/mesa/state_tracker/st_extensions.c

@@ -183,6 +183,10 @@ void st_init_extensions(struct st_context *st)
    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 
+#if FEATURE_OES_draw_texture
+   ctx->Extensions.OES_draw_texture = GL_TRUE;
+#endif
+
    ctx->Extensions.SGI_color_matrix = GL_TRUE;
    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;