Patch to allow optional building of the documentation

[Eric Dorland]

Hello,

As I pointed out in [0], the Debian Project has voted GFDL documents
with Invariant Sections not free according to the DFSG. I will shortly
be removing the documentation from the package in main and moving it
to non-free. Just stripping the doc directory from the tarball doesn't
leave it in a very nice state however. So attached is a patch to allow
automake to build cleanly with the doc directory removed. It also
provides a configure switch to disable building of the
documentation. I believe it to be it to generic enough to be
applicable outside Debian. I hope you agree. 

[0] http://lists.gnu.org/archive/html/automake/2006-03/msg00063.html

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Eric Dorland <address@hidden>
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