[Issue 21569] Unable to rebuild DMD build using win32.mak - v2.095.0

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21569

--- Comment #3 from apham <apz28 at hotmail.com> ---
(In reply to moonlightsentinel from comment #1)
> Does your current environment contain a RES variable?
> 

I see RES is set in build.d module as below
    env.setDefault("RES", dmdRepo.buildPath("src/dmd/res"));

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