gbm: set up the interop extension for egl/drm

breaking libgbm -> libEGL ABI?

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/egl/drivers/dri2/platform_drm.c

@@ -712,6 +712,7 @@ dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
    dri2_dpy->flush = dri2_dpy->gbm_dri->flush;
    dri2_dpy->swrast = dri2_dpy->gbm_dri->swrast;
    dri2_dpy->driver_configs = dri2_dpy->gbm_dri->driver_configs;
+   dri2_dpy->interop = dri2_dpy->gbm_dri->interop;
 
    dri2_dpy->gbm_dri->lookup_image = dri2_lookup_egl_image;
    dri2_dpy->gbm_dri->lookup_user_data = disp;

src/gbm/backends/dri/gbm_dri.c

@@ -246,6 +246,7 @@ static struct dri_extension_match dri_core_extensions[] = {
    { __DRI2_FLUSH, 1, offsetof(struct gbm_dri_device, flush) },
    { __DRI_IMAGE, 1, offsetof(struct gbm_dri_device, image) },
    { __DRI2_FENCE, 2, offsetof(struct gbm_dri_device, fence), 1 },
+   { __DRI2_INTEROP, 1, offsetof(struct gbm_dri_device, interop), 1 },
    { NULL, 0, 0 }
 };
 

src/gbm/backends/dri/gbm_driint.h

@@ -58,6 +58,7 @@ struct gbm_dri_device {
    const __DRIswrastExtension *swrast;
    const __DRI2flushExtension *flush;
    const __DRIdri2LoaderExtension *loader;
+   const __DRI2interopExtension *interop;
 
    const __DRIconfig   **driver_configs;
    const __DRIextension **loader_extensions;