Calling `Process.run()` without SystemRoot set prints "*** Could not create wakeup socket pair for CFSocket!!!" and crashes

[jakepetroules]

When calling Process.run() without the Windows SystemRoot environment variable set, CoreFoundation may print:

*** Could not create wakeup socket pair for CFSocket!!!

and the program may crash shortly afterwards.

It seems like this may be an issue in Windows itself where bind/getsockname/connect have some dependency on that environment variable, but ideally we could print a somewhat more informative error message in this case.