[Issue 18145] Phobos makefile incorrectly sets --dip1000 for DMD when BUILD=debug

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18145

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |greensunny12 at gmail.com

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
This is pretty weird. Dip1000 is only used in DRuntime:

> posix.mak
80:UDFLAGS:=-conf= -Isrc -Iimport -w -dip1000 $(MODEL_FLAG) $(PIC)
$(OPTIONAL_COVERAGE)

Looking at your log I can't see -dip1000 set either. `-conf=` isn't called for
`dmd` in the lexer build, maybe that's the culprit? I.e. you have some local
config or DFLAGS.

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