Make the subproject wrap file declare the dependencies it provides.
Remove the manual subproject invocation and allow Meson to select
whichever wlroots it finds which satisfies the version requirement --
either a system one via pkg-config, or the subproject fallback.
Use a dependency-generic method of acquiring wlroots configuration info
-- enabled features are present in the pkg-config file and additionally
exported as declare_dependency() variables, so there is no need to do C
preprocessor checks for it.
This ensures that Meson best practices are followed, and also...
Fixes#318
Backport of 2656cf525f to v0.5
This simplifies building as there's no need to manually
git clone subprojects anymore.
Building is now as simple as:
meson build
ninja -C build
In order to update the subprojects, meson provides:
meson subprojects update
