[Issue 19485] New: Add more predefined versions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19485

          Issue ID: 19485
           Summary: Add more predefined versions
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: andrew.pennebaker at gmail.com

D's builtin version identifiers are a fairly exhaustive list! Could we add
MINIX and HardenedBSD to the list?

They should be easy to identify with a "Minix", "HBSD" match on `uname -a`,
respectively.

I'd also like to see some musl/Linux editions identified, though those tend to
not appear in a distinguishing way with uname, but instead via `lsb_release
-a`, e.g. "Void" for Void Linux.

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