change how list of modules is computed

change how list of modules is computed

While adding modules I found that the current approach of listing all
the modules on one line made it harder to experiment -- any conflicts
from git were a pain to resolve.

This patch splits the list of modules so that there is one module per
line.

2013-11-18  Tom Tromey  <tromey@redhat.com>

	* gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Split into
	multiple lines.