Updated flex-2.5.4a binary, now works on 10.5 and 10.6.

Updated flex-2.5.4a binary, now works on 10.5 and 10.6.

The 2nd prebuilt binary from change 12014 was missing the
-mmacosx-version-min=10.4 flag used on patch set 1. This
introduced bug #4485 for people building on OS X 10.5.x.

This is an updated binary built with gcc-4.0 with the flags
-arch i386 -mmacosx-version-min=10.4 to address that issue.

https://review.source.android.com/12014
http://code.google.com/p/android/issues/detail?id=4485