[Issue 18550] Offline option for dlang.org makefile

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18550

--- Comment #1 from hsteoh at quickfur.ath.cx ---
(Not to mention, the makefile outright fails because it makes assumptions
incompatible with my system, therefore one of the compilation targets fail. Why
generating HTML docs should depend on compiling a cloned remote repo escapes
me.)

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