signal.c: SIGEXIT is not a system signal
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47669 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
signal.c: SIGEXIT is not a system signal
with internally, so it should not try to register the system
signal handler by sigaction.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47669 b2dd03c8-39d4-4d8f-98ff-823fe69b080e