simplify cygwin handling in Git Bash

[Konfekt]

Just wondering, if the somewhat involved code in

fzf/plugin/fzf.vim

Line 711 in 01e7668

elseif has('win32unix') && $TERM !=# 'cygwin'

to handle fzf in Cygwin or rather Git Bash nowadays can be simplified, for example by Git Bash including /usr/bin/start calling cmd //c.
This was mainly added in the somewhat lengthy PR #933 so maybe @janlazo has clearer ideas why all these measures have to be taken.
In any event, I am happy that Fzf is working Git Bash at all, that's quite a feat;
just wondering if developer's pain could be eased dealing with all the conversion issues.

[Konfekt]

This code has indeed been completely reworked, simplified and cleaned up as documented in #3809
Fzf has become first-class citizen on Microsoft Windows.