MFH: r404691

mail/thunderbird: update to 38.5.0

Changes: https://hg.mozilla.org/releases/comm-esr38/rev/b88229610b41
PR: 205653
Submitted by: Christoph Moench-Tegeder <cmt@burggraben.net>
Security: 2c2d1c39-1396-459a-91f5-ca03ee7c64c6
Approved by: ports-secteam (miwi)