In autotools we had `package_status` which we set to either
`release` or `development`.
When converting from autotools to meson we used that mechanism
as well. But actually meson has a default way of handling this
with the option `buildtype`.
The following values are possible:
debug, debugoptimized, release, plain
So our `package_status = development` will now be
`if get_option('buildtype') == 'debug' or get_option('buildtype') ==
'debugoptimized'`. Probably we could also use
`if get_option('buildtype') == 'release'. But like this the
`plain` will be really plain.
Usage:
```
meson setup build --buildtype=debug
meson compile -C build
```
