[Issue 13436] posix.mak is broken for dlang.org repo

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13436

--- Comment #1 from Andrej Mitrovic <andrej.mitrovich at gmail.com> ---
Also the contributing docs are only valid for the Windows makefile, which is
just sad:

https://github.com/D-Programming-Language/dlang.org/blob/master/CONTRIBUTING.md

$ make -f posix.mak expression.html
>From https://github.com/D-Programming-Language/dmd
 * branch            HEAD       -> FETCH_HEAD
Current release: 2.066.0
make: *** No rule to make target `expression.html'.  Stop.

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