GLProgram: define initialize in ruby, allow attaching shaders

runtime/lib/gl_program.rb

@@ -0,0 +1,8 @@
+class GLProgram
+  # @overload initialize(*shaders, options = {})
+  #
+  # @param shaders [Array<GLShader>] Shaders to attach to the program.
+  # @param options [Hash] Optional parameters.
+  def initialize(*args)
+  end
+end

runtime/main.rb

@@ -4,6 +4,7 @@ end
 
 def load_lib_files
   require "runtime"
+  require "gl_program"
 end
 
 def main(argv)