Mk/Uses/meson.mk: Do not force color output (D29353)

By default Meson forces color output. Ninja strips the escape
sequences before they go into the log. Samurai does not do that,
so we end up with some garbage in the logs. Pass -Db_colorout=never
to Meson to disable colors in general. Also see
https://mesonbuild.com/Builtin-options.html

This requires a small backport in devel/meson since the b_colorout
option is broken with Clang at the moment.

PR: 254678
Exp-run by: antoine