fix tigervnc ctrl-* keys, eg ctrl-c ctrl-v ctrl-d by applying patch to fltk

I'm unsure about
- is it ok to globally apply this patch
- how many rebuilds it triggers
The bug report indicates that others distros just includes this patch (?)
myhasktags update
myhasktags update
Merge branch 'experimental/hack-nix' into refs/top-bases/experimental/updates

* experimental/hack-nix:
  myhasktags update
Merge commit 'refs/top-bases/experimental/updates' into experimental/updates

* commit 'refs/top-bases/experimental/updates':
  myhasktags update

Conflicts:
	pkgs/misc/source-and-tags/default.nix
Merge branch 'experimental/updates' into refs/top-bases/experimental/marc

* experimental/updates:
  myhasktags update
Merge commit 'refs/top-bases/experimental/marc' into experimental/marc

* commit 'refs/top-bases/experimental/marc':
  myhasktags update

Conflicts:
	pkgs/misc/source-and-tags/default.nix