Running airake on win32 outside of cygwin was failing because the native ruby system command doesn't report it's status
code correctly.   This is a two part fix.  The first is in redefining system on win32 to have the correct behavior.
The second is to patch part of win32-process to avoid failing when run within a rake task...

The win32-process patch is here =>
http://rubyforge.org/tracker/index.php?func=detail&aid=13975&group_id=85&atid=413