add experimental support for some more of the MSVC_VARIANTs:

add experimental support for some more of the MSVC_VARIANTs:
- Microsoft .Net Framework SDK Version 1.1
- Microsoft .Net Framework 2.0 SDK
... which seems to work fine now (except for the open problems like zlib) :-)

Some of the plugins need different linker flags depending on the MSVC. I've set a "define" in config.nmake (PLUGIN_LDFLAGS) and used it in the affected plugins/.../Makefile.nmake. Maybe we should generally change the plugins that way.

btw: The "Microsoft Visual C++ Toolkit 2003" (mentioned some time ago on the list) doesn't work as some important files are missing - and we have much easier alternatives now :-)

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@20332 f5534014-38df-0310-8fa8-9805f1628bb7