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numeric.c: Numeric#positive? and Numeric#negative?

• numeric.c (num_positive_p, num_negative_p): add methods
  Numeric#positive? and Numeric#negative?.
  [ruby-core:69173] [Feature #11151]
• numeric.c (flo_positive_p, flo_negative_p): specialiazed
  functions for Float.
• complex.c (Init_Complex): Complex do not have positive? and
  negative? methods

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50522 b2dd03c8-39d4-4d8f-98ff-823fe69b080e