virgl/gbm: use minigbm gbm_bo_map2 function

Minigbm's gbm_bo_map signature has diverged from gbm. Update to
minigbm signature, since virglrenderer now explicitly targets minigbm.

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

src/virgl_gbm.c

@@ -326,7 +326,7 @@ int virgl_gbm_transfer(struct gbm_bo *bo, uint32_t direction, const struct iovec
    host_map_stride0 = 0;
    uint32_t map_flags = (direction == VIRGL_TRANSFER_TO_HOST) ? GBM_BO_TRANSFER_WRITE :
                                                                 GBM_BO_TRANSFER_READ;
-   void *addr = gbm_bo_map(bo, 0, 0, width, height, map_flags, &host_map_stride0, &map_data);
+   void *addr = gbm_bo_map2(bo, 0, 0, width, height, map_flags, &host_map_stride0, &map_data, 0);
    if (!addr)
       return -1;