"GetLocalTimeZoneFromTzFile" is not implemented

[disarray2077]

The function GetLocalTimeZoneFromTzFile that is defined in TimeZoneInfo.bf is not implemented (and issues a FatalError because of that), this causes, for example, the following code to not work on Linux.

String rfc1123Date = DateTime.Now.ToUniversalTime().ToString(.. scope .(), "R");