* gnu/packages/display-managers.scm (lightdm): Update to 1.30.0-0.b7fc321.
[source]: Use git.
[configure-flags]: Add CFLAGS=-Wno-error=missing-prototypes.
[phases]: Delete trailing #t.
{fix-paths}: Use search-input-file.
[inputs]: Add coreutils.
[native-inputs]: Use new style. Replace python-2 by python-wrapper and
python2-pygobject by python-pygobject. Add autoconf, automake, gtk-doc,
libtool, which and yelp-tools.
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