no early injection on WOW64 pre-Vista

From bruen...@google.com on February 02, 2011 12:50:24

this was PR 215423

pre-Vista early injection doesn't work on WOW64 b/c there's no ntdll32 so we have to wait for the later thread injection

one consequence of WOW64 lack of early inject: cannot address early thread problems in cygwin processes

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=381