[21.5] Check for ar, fix 2.13-ism

[Stephen J. Turnbull]

APPROVE COMMIT 21.5

Malcolm Purvis writes:

 > gcc uses 'int' for its version of the test, and has for some years, so it's
 > probably a safe bet for us to use that as well.

OK, Martin had some useful suggestions but I'm obviously not going to
get to them soon so, that's good enough for me.

diff --git a/ChangeLog b/ChangeLog
index 6ee200d..5de4caf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -0,0 +1,5 @@
+2006-12-24  Stephen J. Turnbull  <stephen at xemacs.org>
+
+	* configure.ac (ar): Sun has it but hides it; check for it.
+	(ssize_t): Use the modern check and document todo.
+