* Update install directory to match generated
https://github.com/libsdl-org/SDL/blob/main/CMakeLists.txt#L3122
Sets `SDL2Config.cmake` to `CMAKE_BINARY_DIR`, whereas the install file tries to find it from a different location.
* cmake: use CMAKE_CURRENT_BINARY_DIR instead of CMAKE_BINARY_DIR
* ci: test SDL included as a cmake subproject
Co-authored-by: Anonymous Maarten <anonymous.maarten@gmail.com>
Some CI workers don't seem to understand `cmake -v`, and Windows' shell
doesn't understand `VERBOSE=1 cmake`.
Signed-off-by: Simon McVittie <smcv@collabora.com>
This is usually desirable for batch processing: it lets us see exactly
what is happening in the logs.
Signed-off-by: Simon McVittie <smcv@collabora.com>