Construct paths relative to the Cuberite sources with PROJECT_SOURCE_DIR, instead of wherever the first CMakeLists.txt file happened to be with CMAKE_SOURCE_DIR.
In Android's case, the latter was in a folder called android/ but that's not the root of the source tree, so any file path built off that root was wrong. This caused file-specific warnings exclusions to fail to apply.
* Terminate android build script early if any step fails
* Remove deprecated android types
* Use android NDK cmake support rather than cmake android NDK support as that support is better supported
* Android uses GNU strerror_r?
* Fix compilation
* Rebase
* Fix final issues
* Drop submodule changes
* Revert change
* Parentheses
* Lower api levels
* Don't use GNU strerror_r for Android
Co-authored-by: Mat <mail@mathias.is>
