[Chapel Merge] Use 6 Xs in mktemp calls

Branch: refs/heads/main
Revision: ee3e15c
Author: mppf
Link: Unavailable
Log Message:

Merge pull request #18814 from mppf/mktemp-d-six-x

Use 6 Xs in mktemp calls

On Alpine Linux, make check does not work because the busybox
mktemp -d call requires six Xs at the end. Seems like six Xs
is reasonably good practice in any case, so this PR adjusts
a few mktemp calls to always use six Xs.

  • [x] full local testing

Reviewed by @ronawho - thanks!

Modified Files:
M util/buildRelease/gen_release

M util/cron/test-release.bash
M util/test/checkChplDoc
M util/test/checkChplInstall

Compare: https://github.com/chapel-lang/chapel/compare/acc2a62d0446...ee3e15c18896