[metacity] replace deprecated AM_PROG_LIBTOOL with LT_INIT

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 059f09a5081e1060e5d0cc3c8e29bce4b45fd84f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 30 20:44:58 2015 +0300

    replace deprecated AM_PROG_LIBTOOL with LT_INIT

 configure.ac |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index db05e84..a26ea7a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,6 +50,12 @@ AM_INIT_AUTOMAKE([1.13 no-dist-gzip dist-xz tar-ustar -Wno-portability])
 AM_MAINTAINER_MODE([enable])
 AM_SILENT_RULES([yes])
 
+dnl **************************************************************************
+dnl Initialize libtool
+dnl **************************************************************************
+
+LT_INIT
+
 # Honor aclocal flags
 AC_SUBST(ACLOCAL_AMFLAGS, "\${ACLOCAL_FLAGS}")
 
@@ -61,8 +67,6 @@ IT_PROG_INTLTOOL([0.34.90])
 AC_PROG_CC
 AC_ISC_POSIX
 AC_HEADER_STDC
-AC_LIBTOOL_WIN32_DLL
-AM_PROG_LIBTOOL
 
 #### Integer sizes