Update copyright headers
Switch to Zig 0.9
You can also use your local clone with
Zig easy audio library, or zeal, is an OpenAL wrapper inspired
by alure and palace.
Zeal is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.