[CM] a short guide on compile on msys2/windows with cload.scm

[chai xiaoxiang]

Thanks. It is great that you can do this. I could offer help on compiling at least on my machine if needed.
 
 
> On Fri, May 14, 2021 at 05:23:02AM -0700, bil at ccrma.Stanford.EDU wrote:
> > Thanks very much!  I don't have a machine running Windows
> > or Msys2, but it appears that I can use the __MSYS__ compile
> > time flag to recognize it, then use that to add 'msys2
> > to s7's *features* list, and use that to fix cload.scm.
> > I'll try to do this later today.
> > 
> >