Add a way to embed renderer backends code into NazaraRenderer

xmake/rules/renderer_plugins.lua

@@ -1,8 +1,12 @@
-local modules = NazaraModules
+local modules = NazaraRendererBackends
 
 -- Builds renderer plugins if linked to NazaraRenderer
 rule("build.rendererplugins")
 	on_load(function (target)
+		if has_config("embed_rendererbackends") then
+			return
+		end
+
 		local deps = table.wrap(target:get("deps"))
 
 		if target:kind() == "binary" and (table.contains(deps, "NazaraRenderer") or table.contains(deps, "NazaraGraphics")) then