* complex.c (rb_complex_new_polar): renamed with _new to clarify
  that it creates a new instance, but is not an instance method.

* complex.c (rb_complex_polar): deprecated.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66359 b2dd03c8-39d4-4d8f-98ff-823fe69b080e