[PATCH] Fixed compatibility with old libtool versions.

libtool <= 2.2 doesn't have LT_INIT macro so AC_PROG_LIBTOOL should be
used instead.

See http://bugs.mysql.com/bug.php?id=51009 for in-detail analysis of
same problem.

sflphone-client-gnome/configure.ac

 AC_INIT([SFLphone],[0.9.11],[sflphoneteam@savoirfairelinux.com],[sflphone-client-gnome])
 AM_CONFIG_HEADER(config.h)
 
-LT_INIT
 GNOME_DOC_INIT
 
 PACKAGE=SFLphone