zink: enable srgb-mutable for dmabufs when possible

this should "just work"

...except on intel

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37873>

src/gallium/drivers/zink/zink_resource.c

@@ -1266,7 +1266,8 @@ create_image(struct zink_screen *screen, struct zink_resource_object *obj,
    /* we often need to be able to mutate between srgb and linear, but we don't need general
     * image view/shader image format compatibility (that path means losing fast clears or compression on some hardware).
     */
-   if (!(templ->bind & ZINK_BIND_MUTABLE) && (!alloc_info->whandle || alloc_info->whandle->type == ZINK_EXTERNAL_MEMORY_HANDLE)) {
+   bool can_srgb = screen->driver_workarounds.srgb_dmabufs || (!alloc_info->whandle || alloc_info->whandle->type == ZINK_EXTERNAL_MEMORY_HANDLE);
+   if (!(templ->bind & ZINK_BIND_MUTABLE) && can_srgb) {
       srgb = util_format_is_srgb(templ->format) ? util_format_linear(templ->format) : util_format_srgb(templ->format);
       /* why do these helpers have different default return values? */
       if (srgb == templ->format)

src/gallium/drivers/zink/zink_screen.c

@@ -3032,6 +3032,8 @@ init_driver_workarounds(struct zink_screen *screen)
       abort();
    }
 
+   screen->driver_workarounds.srgb_dmabufs = zink_driverid(screen) != VK_DRIVER_ID_INTEL_OPEN_SOURCE_MESA;
+
    /* these drivers benefit from renderpass optimization */
    switch (zink_driverid(screen)) {
    case VK_DRIVER_ID_MESA_LLVMPIPE:

src/gallium/drivers/zink/zink_types.h

@@ -1544,6 +1544,8 @@ struct zink_screen {
       bool can_2d_view_sparse;
       bool general_depth_layout;
       bool general_layout;
+      /* intel driver is somehow broken for srgb-compatible dmabufs...but only in mesa CI */
+      bool srgb_dmabufs;
    } driver_workarounds;
 };