generate a local copy of libtool for use in compiling

https://bugs.gentoo.org/374355

--- a/configure.in
+++ b/configure.in
@@ -260,9 +260,7 @@ case $host in
         fi
     else
     dnl libtoolize requires that the following not be indented
-    dnl should become LT_INIT(win32-dll)
-AC_LIBTOOL_WIN32_DLL
-AC_PROG_LIBTOOL
+LT_INIT(win32-dll)
         # get libtool's setting of shlibpath_var
         eval `grep "^shlibpath_var=[[A-Z_]]*$" $apr_builddir/libtool`
         if test "x$shlibpath_var" = "x"; then