configure.in: off_t for struct stat.st_size
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47825 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: off_t for struct stat.st_size
and so on. inspired by
http://www.opensource.apple.com/source/ruby/ruby-104/patches/config.h.ed
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47825 b2dd03c8-39d4-4d8f-98ff-823fe69b080e