Comping a Musl-linked druntime & phobos?

[TheGag96]

Hi, all. Has anyone had any success compiling a Musl-linked 
druntime and phobos? I haven't had any luck so far. I'm running 
Linux Mint x64.

Somewhat related - using `-target=x86_64-linux-musl` with dmd 
master doesn't even set the version `CRuntime_Musl`. I asked 
about this in the Discord, and I was told by Horo:

> dmd 2.096 worked well for me. Same for gdc, haven't tried ldc. 
> There is/was a bug that was introduced recently in druntime 
> that broke musl but the older versions should work fine

2.096 doesn't have the `-target` option, and 2.097.0-2.098.0 
don't even build properly for me. Using LDC to build works of 
course, but only with `-betterC` (i.e. no druntime/phobos).