rational.c: pure declarations
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54433 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
rational.c: pure declarations
declarations only, not mixed code and declarations.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54433 b2dd03c8-39d4-4d8f-98ff-823fe69b080e