issue-sl-configure  OS X installer: fix installer builds on 10.6 (Snow Leopard)

            Patch 1: this patch corrects Darwin version tests in configure

APPLIES     py3k, 3.1, 2.6

NOTE        issue-sl-configure-py3k.txt                 py3k
            issue-sl-configure-31.txt                   3.1
            issue-sl-configure-26.txt (this file)       2.6

diff -r e9239b7b4580 configure.in
--- configure.in	Thu Mar 04 11:15:52 2010 -0800
+++ configure.in	Thu Mar 04 13:06:30 2010 -0800
@@ -324,6 +324,8 @@
   # has no effect, don't bother defining them
   Darwin/@<:@6789@:>@.*)
     define_xopen_source=no;;
+  Darwin/1@<:@0-9@:>@.*)
+    define_xopen_source=no;;
   # On AIX 4 and 5.1, mbstate_t is defined only when _XOPEN_SOURCE == 500 but
   # used in wcsnrtombs() and mbsnrtowcs() even if _XOPEN_SOURCE is not defined
   # or has another value. By not (re)defining it, the defaults come in place.