- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

It seems the pre-commit checker doesn't detect illegal character sets. Fix.

Give up on using iconv to convert to UTF-8 at build time. I don't see any
practical way to make iconv(1) as a build tool. Instead pre-convert.
This gives us UTF-8 nvi catalogs even on systems without iconv enabled.