hopefully fix FS#695:

use AC_PROG_LIBTOOL and AC_DISABLE_SHARED instead of
LT_INIT([disable-shared]).  LT_INIT may be the new way of doing this, but the
other are not yet deprecated and I could not get LT_INIT to work

tested with libtool 2.2.6 and 1.5.26

[[Imported from SVN: r5779]]

m4/dune_all.m4

@@ -26,11 +26,12 @@ AC_DEFUN([DUNE_CHECK_ALL],[
   AC_REQUIRE([AC_PROG_CXX])
   AC_REQUIRE([AC_PROG_CXXCPP])
   AC_REQUIRE([AC_PROG_F77])
-  AC_REQUIRE([LT_COMPAT])
+  # don't build shared libs per default, this is way better for debugging...
+  AC_REQUIRE([AC_DISABLE_SHARED])
   # we need libtool
+dnl do not use LT_INIT since we want to be compatible with libtool 1.5
   AC_REQUIRE([AC_PROG_LIBTOOL])
-  # don't build shared libs per default, this is way better for debugging...
-  LT_INIT([disable-shared])
+  AC_REQUIRE([LT_COMPAT])
 
   dnl check dependencies of this module
   dnl this test is autogenerated for each module

m4/libtoolcompat.m4

@@ -3,12 +3,5 @@ dnl libtool 1.5 and libtool 2.x
 
 AC_DEFUN([LT_COMPAT],[
   # LT_COMPAT
-  m4_ifdef([LT_INIT],[],
-  [ 
-    # call AC_DISABLE_SHARED
-    AC_DISABLE_SHARED
-    # fake LT_INIT and LT_OUTPUT
-    AC_DEFUN([LT_INIT])
-    AC_DEFUN([LT_OUTPUT])
-  ])
+  m4_ifdef([LT_OUTPUT],[],[AC_DEFUN([LT_OUTPUT])])
 ])