Add libtool support.

libzebra and libospfapiclient are now built shared, and linked shared
with the daemons.  This reduces the memory needed when running
multiple daemons; each daemon is at least 150k smaller.  Static
libraries are still built, and libtool should use them on platforms
which don't have shared libaries.  As with autoconf, the user of a
distribution does not need libtool; one just needs that to build from
CVS.

libospf.a is still a non-shared library, and still installed, not
because that makese sense, but because I don't understand why it is
the way it is now.

Note that the tree was tagged 'libtool-before' just before this commit.
diff --git a/update-autotools b/update-autotools
index 86dc000..860ee8f 100755
--- a/update-autotools
+++ b/update-autotools
@@ -8,4 +8,5 @@
 aclocal
 autoheader
 autoconf
+libtoolize
 automake --foreign