Mk/Uses/meson.mk: pass --localstatedir like GNU_CONFIGURE after 9f4546a03cc0

Meson defaults to --localstatedir=/var/local if --prefix=/usr/local
but this is not valid for ports/ or FreeBSD hier(7).

See also 68edbeeaae96 and
https://github.com/mesonbuild/meson/commit/24549dbed5fe

PR: 273605
Analyzed by: Tatsuki Makino
Exp-run by: antoine