Drops support for this variable since bitbake no longer supports
parallel queries to the hash equivalence server
(From OE-Core rev: b0769794ca858baa6e814e81b14cf542c33d3a09)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>