Build linux-centos7 (May 20, 2021, 7:38:05 PM)

1. more logging and OS/2 support for exec and pipes (details / githubweb)
2. os2 work on exec + more logging (details / githubweb)
3. fix build and use modern header pattern for version_internal (details / githubweb)
4. added scripts for using QEMU (details / githubweb)

Started by upstream project wwiv build number 3517
originally caused by:

• Started by an SCM change

• refs/remotes/origin/main