zeromq: bump to version 4.2.5

Update the ZEROMQ_SITE with the active repository.
Remove the two patches because they were both applied on zeromq.
As a result, the ZEROMQ_AUTORECONF was removed.

Signed-off-by: Asaf Kahlon <asafka7@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>