Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

tools/tools/locale: skip control character widths

Do not explicitly encode control characters widths as 0
allowing wcwidth() to return the proper implicit value for
non-printable characters (-1).

Reported by: naddy

update wcwidth data from utf8proc

Character width data being out of date is a constant source
of weird rendering issues and wasted time trying to diagnose
those, e.g. as reported by Jeremy Chadwick:

https://gitlab.com/muttmua/mutt/-/issues/67

Sadly, there is no real ("standard") wcwidth data source, so
this tries to rectify the problem using the utf8proc one (through
its C API) which would hopefully benefeat both FreeBSD and
utf8proc through bug reports (if any).

Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D27259