[PATCH] Win32 native fixes after SSL updates (+more)

Hello, i noticed that win32 native stopped working/compiling after the SSL merge.
So i took the opportunity to fix some stuff:

1. Made the thing compile (typos & needed definitions) with the new pqsecure_* stuff, and added fe-secure.c to the
win32.makmakefile.
 
2. Fixed some MULTIBYTE compile errors (when building without MB support).
3. Made it do that you can build with debug info: "nmake -f win32.mak DEBUG=1".
4. Misc small compiler speedup changes.

The resulting .dll has been tested in production, and everything seems ok.
I CC:ed -hackers because i'm not sure about two things:

1. In libpq-int.h I typedef ssize_t as an int because Visual C (v6.0) doesn't define ssize_t. Is that ok, or is there
anystandard about what type should be used for ssize_t? 
 

2. To keep the .dll api consistent regarding MULTIBYTE I just return -1 in fe-connect.c:PQsetClientEncoding() instead
oftaking away the whole function. I wonder if i should do any compares with the conn->client_encoding and return 0 if
nothingwould have changed (if so how do i check that?).
 

Regards

Magnus Naeslund

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 Programmer/Networker [|] Magnus Naeslund
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