[PATCH] erofs-utils: fix the source code hierarchy

[Gao Xiang]

On 2018/12/23 21:02, Li Guifu wrote:
> 1. move generic header files, erofs_fs.h and list_head.h, into include/
> 2. move the other mkfs source files into mkfs/
> 
> Signed-off-by: Li Guifu <blucerlee at gmail.com>

Applied with updating the commit message.

Thanks,
Gao Xiang