Log Message:
libduktape: update to 2.7.

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Duktape 2.7 release notes
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Release overview
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Main changes in this release (see RELEASES.rst for full details):

* Various fixes and portability improvements.

Upgrading from Duktape 2.6
==========================

No action (other than recompiling) should be needed for most users to upgrade
from Duktape v2.6.x.