Martin Kinkelin

`dmd-2.098.0-beta.2` doesn't work (wrong URL)

2

From https://github.com/atilaneves/mirror/pull/28/checks?check_run_id=3742108306: ``` Enabling dmd-2.098.0-beta.2 Downloading http://downloads.dlang.org/releases/2.x/2.098.0-beta.2/dmd.2.098.0-beta.2.linux.tar.xz HTTPError: Unexpected HTTP response: 403 at /home/runner/work/_actions/dlang-community/setup-dlang/v1.0.5/node_modules/@actions/tool-cache/lib/tool-cache.js:100:25 at Generator.next () at fulfilled (/home/runner/work/_actions/dlang-community/setup-dlang/v1.0.5/node_modules/@actions/tool-cache/lib/tool-cache.js:5:58) at processTicksAndRejections (internal/process/task_queues.js:93:5) { httpStatusCode: 403 } ```

WIP: Allow disabling exception trace info via --DRT-traceContext=off

2

This should be more or less what @rainers suggested [here](https://github.com/ldc-developers/druntime/pull/85#discussion_r96054143). Seems to work after a single quick test. Should probably be upstreamed.

Fixes #4651.

WIP: Drop Phobos dependency for compiler tests

6

The goal here is to render `make dmd-test` totally independent from Phobos, only depending on druntime in the same repo here.