gather extra entropy at Windows PuTTY startup time. (It's only used as
one of the inputs to PuTTY's internal entropy pool, so nobody is
required to trust it.)
[originally from svn r9941]
long last to move all the Windows-specific source files down into a
`windows' subdirectory. Only platform-specific files remain at the
top level. With any luck this will act as a hint to anyone still
contemplating sending us a Windows-centric patch...
[originally from svn r4792]