ruby_atomic.h (ATOMIC_OR): should return previous value

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48036 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
signal.c: adjust indent of preprocessing directives

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48037 b2dd03c8-39d4-4d8f-98ff-823fe69b080e