EXFAT: pulled source updates from exfat branch.

https://github.com/dorimanx/exfat-nofuse/commit/296c89c4eaf7afe2c7700c89ed2a4356c61620ff
https://github.com/dorimanx/exfat-nofuse/commit/83ff54eceea281a4fd7fd374a49e16142fd8c284