Skip QTimeZone::isTimeZoneIdAvailable()'s validity check on Unix

[ChangeLog][Corelib][QTimeZone] On Unix (other than macOS and
Android), the TZ-DB backend has long accepted any well-formed POSIX
zone description as a time-zone ID. This is now reflected in
QTimeZone::isTimeZoneIdAvailable(), which previously claimed not to
accept these IDs. However, avaliableTimeZoneIds() still does not
attempt to construct all possible POSIX descriptors to include in its
return.

Change-Id: I1df8df0a4acaca9e70d72f13200b4c31305732f3
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

0 files changed, 0 insertions, 0 deletions