Further MSVC build updates

I just set up to build with MSVC on a brand new box, and came across a
couple of more fixes:

* New versions of OpenSSL come with proper debug versions, and uses
suffixed names on the LIBs for that. Adapts library handling to deal
with that.

* Fixes error where it incorrectly enabled Kerberos based on NLS
configuration instead of Kerberos configuration

* Specifies path of perl in config, instead of using current one.
Required when using a 64-bit perl normally, but want to build pl/perl
against 32-bit one (required)

* Fix so pgevent generates win32ver.rc automatically

//Magnus