Only check for apple macros under boost.

As discussed on the list:
http://lists.boost.org/Archives/boost/2010/06/168213.php

[SVN r63391]

tools/inspect

@@ -1 +1 @@
-Subproject commit 6cbe9ba79db81c9cf90c1a74ed21be44f68fe8b7
+Subproject commit 962a252e2a2f5dec2a1d21655595e9d8e9b7a117