kconf: Enable multiple devpts instances.

This is needed in order to run NixOS VM tests, because within the chroot
the test driver starts the VDE switch, which in turn relies on
posix_openpt() to function correctly.

Which unfortunately doesn't, because CONFIG_DEVPTS_MULTIPLE_INSTANCES
was not set so far.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
collections: Remove most Haskell libraries.

I'm using nix-build for Haskell development for quite some time and thus
do not need to keep around that cruft in my environment.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>