MFC r345524: Import tzdata 2019a
MFC r339503: Import tzdata 2018f
MFC r328055: Import tzdata 2018aMFC r328318: Import tzdata 2018c
MFC r309544:Import tzdata 2016j
MFC r308270: MFV r308265: Update tzdata to 2016i.Sponsored by: The FreeBSD Foundation