pass env to Cache#up_to_date?() and #register_build() instead of user_deps

lib/rscons/builder.rb

@@ -22,12 +22,12 @@ module Rscons
     # Check if the cache is up to date for the target and if not execute the
     # build command.
     # Return the name of the target or false on failure.
-    def standard_build(short_cmd_string, target, command, sources, user_deps, env, cache)
-      unless cache.up_to_date?(target, command, sources, user_deps)
+    def standard_build(short_cmd_string, target, command, sources, env, cache)
+      unless cache.up_to_date?(target, command, sources, env)
         cache.mkdir_p(File.dirname(target))
         FileUtils.rm_f(target)
         return false unless env.execute(short_cmd_string, command)
-        cache.register_build(target, command, sources, user_deps)
+        cache.register_build(target, command, sources, env)
       end
       target
     end