don't treat 0x85 as whitespace

A byte value of 0x85 is not whitespace, we were conflating that with
U+0085 (UTF8: 0xc2 0x85).  This caused us to incorrectly treat valid
multibyte characters like U+88C5 (UTF8: 0xe8 0xa3 0x85) as whitespace.
Merge pull request #2778 from ethomson/whitespace_85

don't treat 0x85 as whitespace