erofs-utils: fuse: disable backtrace if unsupported

Let's enable backtrace conditionally since it's a GNU extension.

Link: https://lore.kernel.org/r/20201217090625.22738-1-hsiangkao@aol.com
Fixes: 5e35b75ad499 ("erofs-utils: introduce fuse implementation")
Reviewed-by: Li Guifu <bluce.lee@aliyun.com>
Signed-off-by: Gao Xiang <hsiangkao@aol.com>
2 files changed