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/media_device/meson.build

@@ -9,10 +9,12 @@ media_device_tests = [
 ]
 
 lib_mdev_test = static_library('lib_mdev_test', lib_mdev_test_sources,
+                               dependencies : libcamera_dep,
                                include_directories : test_includes_internal)
 
 foreach t : media_device_tests
     exe = executable(t[0], t[1],
+                     dependencies : libcamera_dep,
                      link_with : [test_libraries, lib_mdev_test],
                      include_directories : test_includes_internal)