[Issue 18120] Allow DRT options to be set via the environment

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18120

Steven Schveighoffer <schveiguy at yahoo.com> changed:

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                 CC|                            |schveiguy at yahoo.com

--- Comment #2 from Steven Schveighoffer <schveiguy at yahoo.com> ---
so close this?

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