Replace AC_PROG_LIBTOOL with LT_INIT

Change-Id: I642c4b8e83dd07708658a10ad46e9fd2c28a7f1f
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/vlib/configure.ac b/vlib/configure.ac
index 4fdcff1..1a45d33 100644
--- a/vlib/configure.ac
+++ b/vlib/configure.ac
@@ -1,10 +1,10 @@
 AC_INIT(vlib, 1.1)
+LT_INIT
 AM_INIT_AUTOMAKE
 AM_SILENT_RULES
 
 AC_PROG_CC
 AM_PROG_CC_C_O
-AC_PROG_LIBTOOL
 
 AC_ARG_WITH(dpdk,
             AC_HELP_STRING([--with-dpdk],[Use the Intel dpdk]),