[phobos] date related failure in dmd test suite

[Brad Roberts]

With the recent datetime changes (not sure which one exactly), one of the dmd
tests has started failing:

..\src\dmd.exe -m32 -Irunnable   -odtest_results\runnable
-oftest_results\runnable\testzip_0.exe runnable\testzip.d -map nul.map

std.date and std.dateparse have been scheduled for deprecation. Please use
std.datetime instead.

runnable\testzip.d(38): Error: function std.date.toDtime (DosFileTime time) is
not callable using argument types (DosFileTime)

runnable\testzip.d(38): Error: cannot implicitly convert expression (de.time) of
type DosFileTime to DosFileTime

runnable\testzip.d(103): Error: cannot implicitly convert expression
(toDosFileTime(getUTCtime())) of type DosFileTime to DosFileTime