Reenable building on Windows 95 for SDL 1.2

[ElpisActual]

Adds the former VS6 project files and defines socklen_t for the benefit of particularly old SDK versions.

[icculus]

For 1.2?! This is fine with me, if no one else has any objections.

[sezero]

( CC: @ccawley2011 , Related: #42 )

[ElpisActual]

Re socklen_t, fixed; re #42 and comments thereupon, GetAdaptersInfo only officially has support back to 98/2K, but if I do run SDLNet_GetLocalAddresses on W95 (with IE5.5, so the DLL is there) it just doesn't return any interfaces rather than causing a crash.

[sezero]

Re socklen_t, fixed;

Not fully, as it seems. socklen_t isn't a macro, it's a typedef, that's why I suggested the preprocessor check above: some macro that we know not being present in winsock 1.1 headers but present in winsock2 headers.

Besides: You aren't changing winsock includes to winsock 1.1 version and not providing any macro magic to select winsock 1.1 like #42 does: You mention support for very old SDKs, are you saying that those old SDKs have winsock2 headers?

[sezero]

OK, looked at MSVC6, it does have winsock2 headers but doesn't provide socklen_t. Its winsock2 headers (ws2tcpip.h) doesn't define IP_MSFILTER_SIZE either, so the preprocessor check I suggested above is valid for it.

[ElpisActual]

I'm using the slightly later April 1999 SDK, but it seems to have the same version of WS2TCPIP.H as VC++6, so I have applied your suggestion.

[sezero]

OK, I squashed and merged this.

If @ccawley2011 revises #42, it can be re-reviewed, too.