Fix for backport #1975 -- the test suite for backport #1168 uses Dir.mktmpdir, which was backported into 1.8 HEAD and 1.8.7 in the past. This change for 1.8.6 doesn't break anything already existing in 1.8.6, and is a pure-ruby addition, so it was backported. See http://redmine.ruby-lang.org/issues/show/1975
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* lib/tmpdir.rb (@@systmpdir): prior LOCAL_APPDATA if possible, and
should be clean. based on a patch from arton <artonx AT
yahoo.co.jp> at [ruby-dev:35269]
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use GetSystemWindowsDirectory(GetSystemDirectory), not GetTempPath.
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