While changing Cygwin Python to build its core as a DLL (like Win32

While changing Cygwin Python to build its core as a DLL (like Win32
Python) to support shared extension modules, I have learned that Guido
prefers the style of the attached patch to solve the above problem.
I feel that this solution is particularly appropriate in this case
because the following:

    PglargeType
    PgType
    PgQueryType

are already being handled in the way that I am proposing for PgSourceType.

Jason Tishler