winetricks: Update to 1199

(cherry picked from commit 429bdef9bdb34d22ddda2d4291c0ba8adbd7e7c2)
Don't suggest using --arg config '{ allowUnfree = true; }'

This doesn't work when using the Nixpkgs/NixOS channel.

Issue #2998.

(cherry picked from commit e5d63646a092a51f0ad7f38c4d99d2b5685c07ba)
Fix generation of synergy-{client,server} when disabled

(cherry picked from commit 9ae3654fd6d6b797b9ed34e8c42989a3957cc7c4)
Handle <nixpkgs> being a symlink

Fixes #1898.

(cherry picked from commit a7d31fe4491fe18ddc1f80711bc32fb05a19486b)