Android >=14 forbids the use of netlink sockets, and in some configurations
can kill apps that try.
Fixes#9836
Signed-off-by: David Anderson <dave@tailscale.com>
This updates all source files to use a new standard header for copyright
and license declaration. Notably, copyright no longer includes a date,
and we now use the standard SPDX-License-Identifier header.
This commit was done almost entirely mechanically with perl, and then
some minimal manual fixes.
Updates #6865
Signed-off-by: Will Norris <will@tailscale.com>