[Issue 15174] Add or undocument --tmpdir switch

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15174

--- Comment #1 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/D-Programming-Language/tools

https://github.com/D-Programming-Language/tools/commit/df8e39d8346845f20a2f56ec97872873a8f9bd91
rdmd: Add --tmpdir switch as per man page

Fixes issue 15174

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