intern.h: fix declaration
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36379 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
intern.h: fix declaration
prototypes without arguments in C++ have different meanings than C.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36379 b2dd03c8-39d4-4d8f-98ff-823fe69b080e