Remove the NetBSD specific code form bsd-user. It's not been maintained
in any meaningful way since it was introduced to the tree in 2008. It
hasn't been connected to the build since 2021, and last time (in 2023) I
tried to mock-up the meson support it needed, it failed to build. While
there were some out-of-tree work, I've not been able to connect with
that code.
Cc: Reinoud Zandijk <reinoud@netbsd.org>
Cc: Ryo ONODERA <ryoon@netbsd.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>