MAJ tier 1 systems

git-svn-id: http://caml.inria.fr/svn/ocaml/version/3.09@7569 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02

README

@@ -22,10 +22,10 @@ native-code compiler currently runs on the following platforms:
 Tier 1 (actively used and maintained by the core Caml team):
 
     AMD64 (Opteron)    Linux
-    IA32 (Pentium)     Linux, FreeBSD, MS Windows
+    IA32 (Pentium)     Linux, FreeBSD, MacOS X, MS Windows
     PowerPC            MacOS X
 
-Tier 2 (maintained but less actively, with help from users):
+Tier 2 (maintained when possible, with help from users):
 
     Alpha              Digital Unix/Compaq Tru64, Linux, all BSD
     AMD64              FreeBSD, OpenBSD