SR-8078: Some time zone identifiers are not supported by TimeZone on Linux #1616
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TimeZone.knownTimeZoneIdentifiers was returning time zone names
that could not be instantiated by TimeZone(identifier:) due to
CFTimeZone.c:__nameStringOK() filtering out some names.
Make CFTimeZoneCopyKnownNames(), used by .knownTimeZoneIdentifiers,
also filter these names using __nameStringOK().
__nameStringOK calls ICU function ucal_getCanonicalTimeZoneID
which ultimately decides if the time zone is valid.
https://bugs.swift.org/browse/SR-8078