* configure.in (AC_CHECK_HEADERS): atomic.h for Solaris atomic_ops.
* ruby_atomic.h: Skip using Solaris10 atomic_ops on Solaris 9 or earlier if atomic.h is not available. [ruby-dev:47229] [Bug #8228]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40163 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-04-07

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40164 b2dd03c8-39d4-4d8f-98ff-823fe69b080e