wg_engine: add the wgpu_native library dependency.

about the wgpu-native please visit:
https://github.com/gfx-rs/wgpu-native/releases

src/renderer/wg_engine/meson.build

@@ -19,7 +19,11 @@ source_file = [
     'tvgWgShaderTypes.cpp'
 ]
 
+#TODO: force the requirement, when the official wegpu package is distributed.
+wgpu_dep = meson.get_compiler('cpp').find_library('wgpu_native', required: false)
+
 engine_dep += [declare_dependency(
+    dependencies        : wgpu_dep,
     include_directories : include_directories('.'),
     sources : source_file
 )]