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>

test/pipeline/ipu3/meson.build

@@ -4,6 +4,7 @@ ipu3_test = [
 
 foreach t : ipu3_test
     exe = executable(t[0], t[1],
+                     dependencies : libcamera_dep,
                      link_with : test_libraries,
                      include_directories : test_includes_internal)