[PATCH, libphobos] Committed merge with upstream druntime 109f0f2e

[Iain Buclaw]

Hi,

This patch merges the libdruntime sub-directory with upstream druntime 109f0f2e.

Includes more backports for extern(C) bindings, notably for DragonFly
and FreeBSD platforms.  After adding the relevant compiler parts, it
should now be possible to turn on libphobos for x86_64 and i?38
dragronfly and freebsd configurations.

Bootstrapped and regression tested on x86_64-linux-gnu, with build
testing done on x86_64-freebsd11.2 and x86_64-dragonfly5.4.

Committed to trunk as r270490.

-- 
Iain
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