merge revision(s) 50637: [Backport #11172]
* win32/win32.c (setup_overlapped): seek to the file end only when writing (mode:a), not reading (mode:a+, read).
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@50836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 50637: [Backport #11172]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@50836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e