Backport #1975: Backport Dir.mktmpdir
http://redmine.ruby-lang.org/issues/show/1975

Author: Kirk Haines
Status: Assigned, Priority: Normal
Assigned to: Kirk Haines

Dir.mktmpdir exists in 1.8 HEAD and 1.8.7, and is used in the test suite for Backport #1168, so it needs to be backported to 1.8.6 to facilitate use of the existing test suite.


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