Revert "Merge pull request #1078 from syncthing/go1.4"

This reverts commit b658afd85773284c71a12a38d7f1eef4deda7b58, reversing
changes made to 591c5dabf4cfb892a9d26aa8d1a10506e998373b.
WIP
Revisit -no-console option for Windows

The reason for ShowWindow opose to your FreeConsole is because if you start up
cmd.exe and do syncthing.exe -no-output it actually hides the existing cmd.exe
window oppose to opening a separate window and then hiding it, which keeps the
existing console hanging on syncthing.exe running.

I tried playing around with compiling as GUI, then given the option is not present
allocating a console, and redirecting the std streams to the new console, but that
seems ugly as I'd have to make quite a few calls. But that does get of the initial
flash.