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/Makefile.am b/zebra/Makefile.am
index 6b494e7..0782894 100644
--- a/zebra/Makefile.am
+++ b/zebra/Makefile.am
@@ -30,7 +30,7 @@
 	connected.h ioctl.h rib.h rt.h zserv.h redistribute.h debug.h rtadv.h \
 	interface.h ipforward.h irdp.h
 
-zebra_LDADD = ../lib/libzebra.a $(otherobj) $(LIBCAP) $(LIB_IPV6)
+zebra_LDADD = $(otherobj) $(LIBCAP) $(LIB_IPV6) -L../lib -lzebra
 
 zebra_DEPENDENCIES = $(otherobj)
 
@@ -42,8 +42,8 @@
 	ioctl.c ioctl_solaris.c \
 	GNOME-SMI GNOME-PRODUCT-ZEBRA-MIB
 
-#client : client_main.o ../lib/libzebra.a
-#	$(CC) -g -o client client_main.o ../lib/libzebra.a $(LIBS) $(LIB_IPV6)
+#client : client_main.o -L../lib -lzebra
+#	$(CC) -g -o client client_main.o -L../lib -lzebra $(LIBS) $(LIB_IPV6)
 
 quaggaconfdir = $(sysconfdir)