* ext/math/complex.c: followed the above change.

	* rational.c (nurat_canonicalization): renamed.

	* ext/math/rational.c: followed the above change.

	* configure.in: defines a new macro.



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	  for an odd library mathn for the time being (only 1.9.x).
	  since grand mathn is must be very very special library for us.

	* rational.c: ditto.

	* ext/mathn/*/*: follow the above changes.



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	  it's already defined at $(srcdir)/complex.c.

	* ext/mathn/rational/rational.c: no need to define rb_cRational because
	  it's already defined at $(srcdir)/rational.c.



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  first to shut up the warning.

* ext/mathn/rational/rational.c (rb_rational_new_mathn): specify
  omitted return value.

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   function.



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   ext/mathn/complex/complex.c.
 * ext/mathn: new mathn ext-libralies.



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