[tz] Use GST abbreviation for Asia/Dubai, Asia/Muscat

Paul Eggert eggert at cs.ucla.edu
Wed Jul 12 21:40:26 UTC 2017

"GST" was my invention, and as I far as I know it is not typically used 
in English-language sources (other than those derived from tzdata). This 
is why it was removed in release 2017a, along with several other similar 
abbreviations. The idea is that tzdata should reflect common practice 
rather than prescribe it.

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