Change hardcoded path to tzdata directory

[kinke]

On Sunday, 23 December 2018 at 22:40:38 UTC, Petar Kirov 
[ZombineDev] wrote:
> That change was merged quite a while ago, so it was part of DMD 
> 2.079 and LDC 1.9

Ah yeah, I only noticed December [2017] and thought it was 
brand-new. ;)

> On related note, I have observed several times at least where 
> changes to the build system upstream weren't propagated 
> downstream to GDC and LDC as you guys are using different build 
> systems. The -dipxxxx and -transition=xxxxx flags look like 
> future trouble maker candidates. Any suggestions how we could 
> make this easier for you?

-dip already was IIRC. Don't you have a file with a list of files 
to be compiled with DIP1008 or something? ;)

I surely don't want to step down to Makefiles. E.g., with CMake 
we don't have to maintain a (or actually, multiple) Makefiles 
whenever adding, removing or moving some module (although I guess 
that'd be possible with Makefiles too). And there's quite a lot 
of LDC specifics, for cross-compilation, LTO etc.

We have the testsuite at least, so something breaking can hardly 
be missed. Good test coverage is the best way to catch our 
attention.