[phobos] Phobos datetime unittests fail on German Windows 7

[Don Clugston]

unittest
totalCPUs = 4
[]Failed time zone: America/Los_Angeles
core.exception.AssertError at std\datetime.d(27754): _assertPred!"=="
failed: [Pacific Normalzeit] is not == [Pacific Standard Time].

Seems as though it assumes that OS time zone names are in English.
I also notice that some recent change to Phobos tests (possibly this
one) makes them take about 4X as long to run. (compilation time is a
bit slower as well, but I'm talking about the run time).