Replace AC_PROG_LIBTOOL with LT_INIT

Change-Id: I642c4b8e83dd07708658a10ad46e9fd2c28a7f1f
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/vpp-japi/configure.ac b/vpp-japi/configure.ac
index d9778fe..1607061 100644
--- a/vpp-japi/configure.ac
+++ b/vpp-japi/configure.ac
@@ -1,9 +1,9 @@
 AC_INIT(vpp-japi, 1.0.0)
+LT_INIT
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE
 AM_SILENT_RULES
 
-AC_PROG_LIBTOOL
 AM_PROG_AS
 AC_PROG_CC
 AM_PROG_CC_C_O