Remove old MSVC++ (pre-VC12) support from Windows Makefiles

Also remove the Platform SDK 2003 SP1/R2 64-bit compiler since (having just
tried it) it no longer builds perl because it doesn't allow mixed code and
declarations.

Also remove mention of the Windows SDK since it doesn't appear to contain
the compiler or linker any more. This page says that the VC++ 2010 compiler
and linker were included in the Windows 7 SDK but then makes no mention of
it for the Windows 8 SDK:
https://docs.microsoft.com/en-us/previous-versions/visualstudio/windows-sdk/ff660763(v=vs.110)
The page notes that it is no longer being updated, but the whole of the
C:\Program Files (x86)\Windows Kits folder on my system (which contains
8.0, 8.10 and 10) does not contain any cl.exe or link.exe.

I've re-worded some of the if/else conditions in the makefiles to pick out
earlier versions rather than later versions. Thus, the current versions
become the "else" case, which means that the next version of Visual C++ is
more likely to work without requiring any changes.

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