[Chapel Merge] Print command if execvp fails in chpl_launch_using

Branch: refs/heads/main
Revision: 9622358
Author: gbtitus
Link: print command if execvp fails in chpl_launch_using_exec by milthorpe · Pull Request #19705 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #19705 from milthorpe/launcher

Print command if execvp fails in chpl_launch_using_exec.

(Contributed by @milthorpe -- thanks! Reviewed by @gbtitus.)

Many of our most commonly used launchers use this technique to run the
system launcher. This will make it easier to see what's gone wrong when
that fails.

Modified Files:
M runtime/src/chpl-launcher-common.c

Compare: https://github.com/chapel-lang/chapel/compare/59499c273f11...9622358b3fe0