main: allow external textures for BindImageTexture
From issue 10 of the OES_EGL_image_external_essl3:
A limited set of use-cases is enabled by making glBindImageTexture accept external textures. Shaders can access such external textures using the existing sampler type.
Fixes: 02a6d901 ("mesa: add OES_EGL_image_external_essl3 support")
Signed-off-by: Yevhenii Kolesnikov yevhenii.kolesnikov@globallogic.com
Edited by Yevhenii Kolesnikov