[BUGS] Version control for DLLs installed into WINNT/system32

[Markus Öllinger]

I've found that if you have installed a previous beta release (e.g. beta4) 
and deinstall it, then the DLLs in system32 are not removed (e.g. 
libpq.dll). Furthermore, if you then install beta5, it does not complain but 
doesn't overwrite the old versions either.

As a consequence, the old DLLs are used by beta5 and the DB does not work.
The same applies to libeay32.dll.
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