llvmpipe: enable seamless cube filtering

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -175,7 +175,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
-      return 0;
+      return 1;
    case PIPE_CAP_SCALED_RESOLVE:
       return 0;
    /* this is a lie could support arbitrary large offsets */