how to pass -pie flag to dmd(or rdmd or ldc) ?

[Timothee Cour via Digitalmars-d]

Can we do this is 1 step?

```
rdmd -offoo.o -c foo.d
g++ -o foo foo.o -pie -Wl,--export-dynamic
```

Ideally something like this would be great:

```
rdmd -offoo -extra_flags=-pie foo.d
```

where -extra_flags=flag1,flag2 can takes comma separated options
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