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

diff -r 593650e36af4 configure.in
--- configure.in	Thu Mar 04 17:08:23 2010 -0800
+++ configure.in	Thu Mar 04 23:35:03 2010 -0800
@@ -322,6 +322,8 @@
   # 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.