Fix AttributeError: __exit__ on Python 2.6
Error occurs while dealing with Tar archives
To reproduce run ./configure --with-intl=full-icu --with-icu-source=icu4c-60_1-src.tgz
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data