in m4/Makefile.am, add glib-2.0.m4 to EXTRA_DIST, so that nano builds

in m4/Makefile.am, add glib-2.0.m4 to EXTRA_DIST, so that nano builds
from CVS with automake 1.7.x again; for some reason, automake 1.9.x
didn't have a problem with its (erroneously) being left out; also add
some formatting fixes to other Makefile.am's dealing with too many or
too few blank lines

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2089 35c25a1d-7b9e-4130-9fde-d3aeb78583b8