MFC r353127:

Pre-generate Big5 charmap from CLDR data.

The one used previously was missing the characters in 0-127 range,
making various tools try to escape them in output.

PR: 235100
Reviewed by: bapt
Tested by: Ting-Wei Lan <lantw44@gmail.com>
Differential Revision: https://reviews.freebsd.org/D21794