fixed the pattern for avoiding the poll check

added some comments about known problems with poll on darwin

configure.ac

@@ -230,11 +230,16 @@ case $host in
 esac
 
 case $host in
-  darwin*|interix*)
+  *darwin*|*interix*)
     dnl poll() does not work on these platforms
     dnl Interix: "does provide poll(), but the implementing developer must
     dnl have been in a bad mood, because poll() only works on the /proc
     dnl filesystem here"
+    dnl Mac OS X's poll has funny behaviors, like:
+    dnl not being able to do poll on no fildescriptors (10.3?)
+    dnl not being able to poll on some files (like anything in /dev)
+    dnl not having reliable timeout support
+    dnl inconsistent return of POLLHUP where other implementations give POLLIN
     AC_MSG_NOTICE([poll use is disabled on this platform])
     ;;
   *)