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/zebra/ChangeLog b/zebra/ChangeLog
index da3210e..cf18a7d 100644
--- a/zebra/ChangeLog
+++ b/zebra/ChangeLog
@@ -1,3 +1,9 @@
+2004-06-30  Greg Troxel  <gdt@poblano.ir.bbn.com>
+
+	* main.c: define thread_master variable so that linking with
+	libzebra.so doesn't fail.  Arguably zclient.o should be in a
+	separate library, but this is far less disruptive.
+
 2004-06-12 Robert Olsson <Robert.Olsson at data.slu.se>
 
         * Added IRDP support.