exfat: update to 5.10.1

exfat: update to 5.10.1

Remove tar hacks and use PKG_BUILD_DIR.

Added missing URL.

Changelog:

d5eb2e1 exfat: remove useless check in exfat_move_file()
8cb2bc3 exfat: use i_blocksize() to get blocksize
4cd0435 exfat: fix misspellings using codespell tool
485d677 exfat: fix use of uninitialized spinlock on error path
03b3db6 exfat: remove 'rwoffset' in exfat_inode_info
90797eb exfat: replace memcpy with structure assignment
d144149 exfat: remove useless directory scan in exfat_add_entry()
fc67230 exfat: eliminate dead code in exfat_find()
7c25c64 exfat: fix pointer error checking
bfea1fb exfat: retain 'VolumeFlags' properly

Signed-off-by: Rosen Penev <rosenp@gmail.com>