[Issue 16349] New: better curl retry for install.sh script

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16349

          Issue ID: 16349
           Summary: better curl retry for install.sh script
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: installer
          Assignee: nobody at puremagic.com
          Reporter: code at dawg.eu

Sometimes the install script fails b/c of some temporary network failure.
All downloads should use some limited retry mechanism to recover from those.
This problem is particularly annoying since it leads to spurious Travis-CI
failures.

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