* hash.c (ruby_setenv): do not check environment block size.
c.f. https://msdn.microsoft.com/en-us/library/windows/desktop/ms682653(v=vs.85).aspx
Starting with Windows Vista and Windows Server 2008, there is no
technical limitation on the size of the environment block.
[ruby-core:88400] [Bug #14979]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64293 b2dd03c8-39d4-4d8f-98ff-823fe69b080e