* include/ruby/ruby.h: constify RRational::(num,den) and
  RComplex::(real,imag).
  Add macro to set these values:
* RRATIONAL_SET_NUM()
* RRATIONAL_SET_DEN()
* RCOMPLEX_SET_REAL()
* RCOMPLEX_SET_IMAG()
  This change is a part of RGENGC branch [ruby-trunk - Feature #8339].
  TODO: API design. RRATIONAL_SET(rat,num,den) is enough?
  TODO: Setting constify variable with cast has same issue of r40691.
* complex.c, rational.c: use above macros.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-05-14

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40699 b2dd03c8-39d4-4d8f-98ff-823fe69b080e