internal.h: remove prototype for non-existent rb_divert_reserved_fd
I forgot to remove it 3 years ago in r51576
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
internal.h: remove prototype for non-existent rb_divert_reserved_fd
I forgot to remove it 3 years ago in r51576
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e