[phobos] Makefile

[Andrei Alexandrescu]

I'm rewriting the Linux makefile. The existing one works well and is 
small, but Walter complained about it being impenetrable and I agree. It 
uses weird string expansions and stuff.

Back when I wrote it that was the only method I could find to avoid 
repeating a lot of stuff for all OSs, builds, unittests, etc. Recently, 
inspired by Walter, I decided to go with a different approach that 
relies on recursive make invocations. That simplifies matters 
drastically: no more string expansions, no more '$$', no more crap.

By this I'm asking you what you'd like to see in the makefile. What are 
the builds that you need and use, and what builds you'd like to use that 
aren't there?


Andrei