qitoolchain: create a toolchain file when creating a new toolchain
qitoolchain: create a toolchain file when creating a new toolchain

Otherwize, qibuild will try to include a non-existing file if the toolchain
is empty

aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild