forked from HowardHinnant/date
In commit commit 0b72599bd4 there
was a change to read "version" in addition to "+VERSION", so that
file shold also be ignored when scanning/reading zonefiles.
Also before the above mentioed commit get_version() would return
"unknown" if not on __APPLE__ and the version file was not found.
Put back that behaviour, for all USE_OS_TZDB users.
This last change changes the behaviour for __APPLE__ from throwing
an exception to returning "unknown".
Co-authored-by: Lars Gullik Bjønnes <lbjonnes@cisco.com>