Fix multiple components usage for --foreign

commit e24e4b00, bug #757819 made resolve_deps and
setup_available in the --foreign case. However this only worked when
using just one component as the USE_COMPONENTS variable is | delimited.

Translate the USE_COMPONENTS variable on the fly from | delimited to
space delimeted to allow multiple components to work again.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>