[stable] LDC: Fix ddox regression (prevent colliding HTML output files)

[kinke]

No description provided.

[github-actions]

Thanks for your Pull Request and making D better!

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[Geod24]

Doesn't fix it I think:

/home/mlang/dlang/ldc-1.39.0/bin/ldc2 -o- -w -lowmem -Xf=docs.json -Df=__dummy.html -d-version=_GLIBCXX_USE_CXX98_ABI -d-version=Have_barcode -d-debug=AgoraDebugAPIs -Isubmodules/barcode/source/ submodules/barcode/source/barcode/code128.d submodules/barcode/source/barcode/code39.d submodules/barcode/source/barcode/ean13.d submodules/barcode/source/barcode/itf.d submodules/barcode/source/barcode/package.d submodules/barcode/source/barcode/qr/ecl.d submodules/barcode/source/barcode/qr/package.d submodules/barcode/source/barcode/qr/qrcode.d submodules/barcode/source/barcode/qr/qrsegment.d submodules/barcode/source/barcode/qr/util.d submodules/barcode/source/barcode/qrwrap.d submodules/barcode/source/barcode/svgdraw.d submodules/barcode/source/barcode/types.d submodules/barcode/source/barcode/util.d -preview=in -revert=dtorfields -preview=in -revert=dtorfields -vcolumns
Error: Output file '__dummy.html' for module `barcode.code39` collides with previous module `barcode.code128`. See the -oq option
FAIL submodules/barcode barcode staticLibrary

[kinke]

Okay, added the -oq option for ddox explicitly. The other compilers apparently don't check for HTML output file collisions.

[Geod24]

That did the trick, thanks!