#8 win32api etc should alias code moved to the core

[Mark Hammond]

win32pipe.popen and win32api.Reg* should be removed
from the source-tree, and dynamically load the versions
in Python itself. This way bugs fixed in the core are
reflected here magically. Eg, see
https://sourceforge.net/tracker/index.php?func=detail&aid=722413&group_id=5470&atid=105470

I would rather spend the effort aliasing _winreg than
duplicating the fix in win32api. However, this will
almost certainly mean win32api.error should subclass
os.WindowsError.