Update git-cipher submodule
Update git-cipher submodule

Mostly want the changes to executable permissions handling, seeing as I
recently added my first encrypted file that is supposedly to be
independently executable (the presync/work.sh script).

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent