* io.c (rb_cloexec_fcntl_dupfd): improve #ifdef condition.
* io.c (rb_maygvl_fd_fix_cloexec): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38699 b2dd03c8-39d4-4d8f-98ff-823fe69b080e