Bug#828057: Update fuse-exfat to 1.2.4

[Marcos Mello]

Package: fuse-exfat
Version: 1.2.3-1

fuse-exfat 1.2.4 implements compressed upcase table support:

https://github.com/relan/exfat/issues/30
https://github.com/relan/exfat/commit/aab123c9ab1d9aec143cf92c7f1615a8e65f820b