Enable tcl for windows/arm64 target

[niyas-sait]

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[niyas-sait]

Many thanks, @nijtmans, and @andreas-kupries for pushing the patch to tcl official repository.

Could you help with similar changes for TK Package as well? tcltk/tk#12

[nijtmans]

Thank you for this contribution. As it is now, it should be sufficient to build a static version of tclsh, but a dynamic one will not work yet. The problem is that tcl86.dll depends on zlib1.dll, which is not provided for arm64. So, that's the next step on my TODO list. I wouldn't be surprised if more problems arise, feel free to report them.

Best way to get our attention is to file a ticket here, since github is only a mirror of the official Tcl repo

[niyas-sait]

Thanks a lot, @nijtmans. Yes, I hit the same problem with dynamic builds. Zlib for windows-arm64 needs a minor tweak to the base address for the DLL to compile.

If you remove the explicit base_address from zlib's win32\Makefile.msc then it can be compiled and seems to work. It is not clear to me why zlib have the explicit default base address. I've asked the zlib maintainers if it is okay to remove them for arm64 builds.

[niyas-sait]

Thanks @nijtmans. I've raised https://core.tcl-lang.org/tcl/tktview/d109376adf418ce6d047fb0017d40848272a518f for cross-compilation support