Disable a feature (unused), so that autotools on COSMA are acceptable

We have 2.63 and 2.64 is required!


Former-commit-id: af0f689646357c801e085f58ea4184024e0de9fb

m4/ax_check_enable_debug.m4

@@ -117,8 +117,9 @@ AC_DEFUN([AX_CHECK_ENABLE_DEBUG],[
 
     dnl Define various variables if debugging is disabled.
     dnl assert.h is a NOP if NDEBUG is defined, so define it by default.
-    AS_IF([test "x$enable_debug" = "xyes"],
-      [m4_map_args_w(ax_enable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is enabled])])],
-      [m4_map_args_w(ax_disable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is disabled])])])
+    dnl XXX disabled as m4_map_args_w requires 2.64, and COSMA has 2.63.
+    dnl AS_IF([test "x$enable_debug" = "xyes"],
+    dnl  [m4_map_args_w(ax_enable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is enabled])])],
+    dnl  [m4_map_args_w(ax_disable_debug_vars, [AC_DEFINE(], [,,[Define if debugging is disabled])])])
     ax_enable_debug=$enable_debug
 ])