[Issue 19485] Add more predefined versions

[d-bugmail at puremagic.com]

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

--- Comment #2 from andrew.pennebaker at gmail.com ---
Thank you for pointing out CRuntime_Musl!

Regarding Void Linux, it is useful for me to identify Void Linux hosts as
opposed to other Linux hosts, because Void Linux's valgrind is unfortunately
somewhat broken. And so I would like to disable valgrind checking in my build
system whenever the host is detected as Void Linux.

For now, I am doing this with a runtime match against `lsb_release -a`, but I
would prefer that this be done at compile time for efficiency's sake.

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