Update Ext2Fsd to version 0.69 from version 0.68

Ext2Fsd 0.69 released !

November 2nd, 2017

WARNINGS:

    Don't use Ext2Fsd 0.68 or earlier versions with latest Ubuntu or

    Debian systems. Ext2Fsd 0.68 cannot process EXT4 with 64-BIT mode

    enabled, then it could corrupt your data. Very sorry for this

    disaster issue, I'm working on an improvement.

Features implemented and bugfix:

    1, FIXME: superblock corruption of EXT4 volumes with 64BIT mode enabled 

    2, FIXME: possible corruption by race conditions in buffer-head reapering

    3, FIXME: possible deadlock issues (when flushing) caused by BCB locks

    4, FIXME: miscellaneous minor updates of Ext2Fsd code base