winsys/radeon: remove the device file descriptor from the interface

r600g doesn't need it anymore.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

src/gallium/winsys/radeon/drm/radeon_drm_winsys.c

@@ -316,7 +316,6 @@ struct radeon_winsys *radeon_drm_winsys_create(int fd)
     }
 
     ws->fd = fd;
-    ws->info.fd = fd;
 
     if (!do_winsys_init(ws))
         goto fail;

src/gallium/winsys/radeon/drm/radeon_winsys.h

@@ -73,7 +73,6 @@ struct radeon_info {
     uint32_t pci_id;
     uint32_t gart_size;
     uint32_t vram_size;
-    uint32_t fd; /* XXX transitional */
 
     uint32_t drm_major; /* version */
     uint32_t drm_minor;