CBLT-42:  fix more DOS typos (must use "set FOO=bar")

Change-Id: I30315c8019ff43fa837dd7e5433132cc3fc1abe1
Reviewed-on: http://review.couchbase.org/37198
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>