[Chapel Merge] Bring in an upstream conftest fix for qthreads

Branch: refs/heads/main
Revision: e41fe78
Author: ronawho
Log Message:

Merge pull request #18272 from ronawho/qt-conftest-fix

Bring in an upstream conftest fix for qthreads

[reviewed by @bradcray]

Bring in Qthreads/qthreads#84 to resolve conftest errors on Ubuntu
systems. This adds signal handling to some configure tests to avoid
popups that some users have seen on Ubuntu desktop.

Resolves Bring in an upstream syscall errno fix for qthreads by ronawho · Pull Request #18116 · chapel-lang/chapel · GitHub<
Resolves https://github.com/Cray/chapel-private/issues/2351

Modified Files:
M third-party/qthread/README

M third-party/qthread/qthread-src/config/qthread_check_bitfield_order.m4
M third-party/qthread/qthread-src/config/qthread_check_qsort.m4

Compare: https://github.com/chapel-lang/chapel/compare/6ecd08176311...e41fe78a788e