Use LT_INIT instead of deprecated AC_PROG_LIBTOOL

Author: hpi1

configure.ac

@@ -136,7 +136,7 @@ dnl required programs
 AC_PROG_CC
 AM_PROG_CC_C_O
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
-AC_PROG_LIBTOOL
+LT_INIT
 
 dnl required headers
 AC_CHECK_HEADERS([stdarg.h sys/types.h dirent.h errno.h libgen.h malloc.h])