Revert "use a cached file dependencies in order to reduce the build time"

This reverts commit ee514286cf.

Now, detecting build order is much faster without cache by previous commit.
So, let's revert this commit.

lib/motion/project/builder.rb

@@ -166,14 +166,7 @@ module Motion; module Project;
 
       # Resolve file dependencies.
       if config.detect_dependencies == true
-        deps = Dependency.new(config.files - config.exclude_from_detect_dependencies, config.dependencies)
-        deps.cache_path = File.join(objs_build_dir, "dependencies.rb")
-
-        config.dependencies = deps.run
-        unless deps.updated?
-          config.ordered_build_files = deps.ordered_build_files
-        end
-        deps.save_cache(config.ordered_build_files)
+        config.dependencies = Dependency.new(config.files - config.exclude_from_detect_dependencies, config.dependencies).run
       end
 
       parallel = ParallelBuilder.new(objs_build_dir, build_file)
@@ -616,7 +609,6 @@ EOS
       require 'ripper'
     end
 
-    attr_accessor :cache_path
     @file_paths = []
 
     def initialize(paths, dependencies)
@@ -671,49 +663,9 @@ EOS
         end
       end
 
-      @dependencies = dependency
       return dependency
     end
 
-    def updated?
-      return true unless File.exist?(@cache_path)
-
-      begin
-        require @cache_path
-        if @dependencies != cached_dependencies
-          return true
-        end
-      rescue
-      end
-
-      false
-    end
-
-    def ordered_build_files
-      return nil unless File.exist?(@cache_path)
-
-      begin
-        require @cache_path
-        cached_ordered_build_files
-      rescue
-        nil
-      end
-    end
-
-    def save_cache(ordered_build_files)
-      begin
-        File.open(@cache_path, 'w') { |io|
-          methods =
-          "module Motion; module Project; class Dependency;\n" +
-          "def cached_dependencies; " + @dependencies.inspect + "; end\n" +
-          "def cached_ordered_build_files; " + ordered_build_files.inspect + "; end\n" +
-          "end; end; end"
-          io.write(methods)
-        }
-      rescue
-      end
-    end
-
     class Constant < Ripper::SexpBuilder
       attr_accessor :defined
       attr_accessor :referred

lib/motion/project/config.rb

@@ -254,10 +254,6 @@ module Motion; module Project
       end
     end
 
-    def ordered_build_files=(order)
-      @ordered_build_files ||= order
-    end
-
     def spec_core_files
       @spec_core_files ||= begin
         # Core library + core helpers.