merge revision(s) r48184: [Backport #10272] [Backport #10438]
* configure.in (__builtin_setjmp): disable with gcc/clang earlier than 4.3 on Mac OS X. [ruby-core:65174] [Bug #10272]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@48274 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r48184: [Backport #10272] [Backport #10438]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@48274 b2dd03c8-39d4-4d8f-98ff-823fe69b080e