windows-release/tcltk-build: Update to handle Tcl/Tk 9

[zware]

• tcltk-build: Remove Tix
• tcltk-build: Split {Tcl,Tk}SourceTag into version and prefix parameters

[zooba]

Apart from the CI failure, looks good to me. I guess they need some better cross-compiling support, but hopefully you can override a build variable to get it to use the Win32 build during the ARM64 one?

[zware]

Yep, looking into what else needs the override now.

[zooba]

Another trick we could use here is to extract the version number from the header file, that way we can go back to setting just the tags when building:

$ver = @{}
Get-Content .\generic\tcl.h | ?{ $_ -match '#\s*define\s+TCL_([A-Z]+)_VERSION\s+(\d+).*'} | %{ $ver[$Matches[1]] = $Matches[2] }
$ver.MAJOR
$ver.MINOR

That doesn't help people trying to build separately (without this script), but the current change doesn't help them either.