AUR updates for 1.27.0

[ghbrown]

This PR updates the Arch User Repository package "chapel", which is static source. Build files for "chapel-git" (which points to chapel-lang/chapel/main) were also changed, but only to update its version number on the remote host, which is purely cosmetic.

The previous version of the static source package did not build on Arch due to issues discussed in #19837 . I'm happy to report that there were no issues building 1.27 on Arch, and the installed compiler also worked on some simple test programs (one of the problems resolved since 1.26).

This effectively removes the primary "outstanding issue" from #19837, and all "future work" remains the same as far as I can tell.

[mppf]

Looks great! I'll merge it.

FYI we have just started requiring cmake to build Chapel (as of #19565) so it would be good to add that as a dependency in the chapel-git package. Thanks.

[ghbrown]

Thanks for merging!

I'll add the CMake dependency to the actual chapel-git files. Do you want me to make a PR just for that here, or is okay to wait until it the next build file update for 1.28, etc.?

[mppf]

It's OK to wait. (And, now that we have the READMEs etc, it would not be that big a deal if these files become a bit out of date, but I appreciate your efforts to keep them updated. One thing it does is gives us a chance to talk about it - like the cmake dependency being relevant.) In the future we might be able to set up nightly testing for these arch packages and then the ones in the chapel repo would need to be up to date. But we are not there yet.