Native Windows, Apache Portable Runtime

Upon doing some inspection of apache 2.x, it seems that me making a SysV
Windows .DLL for PostgreSQL, while a cool project, would be unnecessary.

The APR (Apache Portable Runtime) seems to have all the necessary support. The
problem is that it has its own API.

We should find a way to extract the APR out of apache and make it a library
within PostgreSQL. A quick look at the license seems to indicate this is OK.
Should we notify the Apache guys just to be polite?

It looks like the APR is pretty analogous to SysV with a few changes, so it
should not be too hard to code it into PostgrsSQL.