meson: Create and use a dependency for libcamera and its headers

Instead of manually adding the libcamera library and include path to
every target that requires it, declare a dependency that groups the
headers as source, the library and the include path, and use it through
the project. This simplifies handling of the dependency.

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

src/cam/meson.build

@@ -6,6 +6,5 @@ cam_sources = files([
 ])
 
 cam  = executable('cam', cam_sources,
-                  link_with : libcamera,
-                  install : true,
-                  include_directories : libcamera_includes)
+                  dependencies : libcamera_dep,
+                  install : true)