* coroutine/win32/Context.asm: old ml version 9 needs CPU
directive before `.model` directive.
* win32/Makefile.sub: specify object directories to separate Win32
and Win64 targets. Win32 rule was overridden by Win64 rule and
just ignored.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66059 b2dd03c8-39d4-4d8f-98ff-823fe69b080e