proper prebuild
proper prebuild

For some reason, this project uses prebuilds but not prebuild-install
to download the builds from GitHub.

Change-Id: Ie9ba16d2f1179d658ebd1463c4f74b993ea22e18
Reviewed-on: http://review.couchbase.org/77994
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/couchnode,brett19/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,couchbase/couchnode,couchbase/couchnode