OSL 1.10.8

Release 1.10.8 -- 1 Dec 2019 (compared to 1.10.7)

• Fix dual implementation of division so that the value is consistent with
  regular division (#1066)
• Python3 safety of tests and scripts. #1071
• Handle escaped string literals (like "\tfoo\n") more correctly. #1073
• Fixes to ensure locale independence. #1075
• Build: on OSX, better logic about the OIIO plugin must be built as a
  module or as a shared library. #1078
• Remove pointless assertions from the TypeSpec class. #1079