libcamera: utils: Add a function to retrieve the libcamera source tree

Similarly to libcameraBuildPath(), there's a need to locate resources
within the source tree when running libcamera without installing it.
Support this use case with a new utils::libcameraSourcePath() function.

The implementation uses a symlink from the build root to the source root
in order to avoid hardcoding the path to the source root in the
libcamera.so binary.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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