[Issue 4567] dmd should print the dmd.conf location with usage statement

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=4567

--- Comment #8 from hst...@quickfur.ath.cx ---
Updated the PR to display the config file along with the usage text, so you can
see it if you run dmd with no input files.

--