[gnome-applets] configure.ac: replace deprecated AM_PROG_LIBTOOL with LT_INIT

[Alberts Muktupāvels <muktupavels src gnome org>]

commit b36d39faf382976e3754a224a7103dbbde8cd516
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 30 20:29:46 2015 +0300

    configure.ac: replace deprecated AM_PROG_LIBTOOL with LT_INIT

 configure.ac                 |   11 +++++++----
 windowpicker/src/Makefile.am |    2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 26aa8f2..1faee21 100644
--- a/configure.ac
+++ b/configure.ac
@@ -49,6 +49,13 @@ 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([dlopen disable-static])
+LT_LIB_M
+
 dnl ***************************************************************************
 dnl *** Minimum library versions for GNOME-APPLETS                          ***
 dnl ***************************************************************************
@@ -80,16 +87,12 @@ fi
 AC_PROG_CC
 AC_ISC_POSIX
 AC_STDC_HEADERS
-AM_PROG_LIBTOOL
 AC_PATH_XTRA
 AM_PATH_PYTHON(3)
 
 X_LIBS="$X_LIBS $X_PRE_LIBS -lX11 $X_EXTRA_LIBS"
 AC_SUBST(X_LIBS)
 
-dnl Check for libm
-LT_LIB_M
-
 dnl Check for non-portable headers
 AC_CHECK_HEADERS([pty.h values.h])
 
diff --git a/windowpicker/src/Makefile.am b/windowpicker/src/Makefile.am
index c2d273d..f537941 100644
--- a/windowpicker/src/Makefile.am
+++ b/windowpicker/src/Makefile.am
@@ -10,7 +10,7 @@ libwindow_picker_applet_la_CFLAGS = \
        -DGTK_DISABLE_SINGLE_INCLUDES \
        -I$(top_builddir) \
        -I$(top_srcdir) \
-       -lm \
+       $(LIBM) \
        $(GNOME_APPLETS_CFLAGS) \
        $(LIBWNCK_CFLAGS) \
        $(GCC_FLAGS) \