zeromq: remove unneeded patch after version bump

Commit b3c525b8 has bumped zeromq to
version 2.3.4, which makes the patch
zeromq-0001-test-collect-delay-end-of-line.patch unneeded since it has
been merged upstream.

Fixes:

  http://autobuild.buildroot.org/results/e8c/e8c8ba8c31fd081c34c8772790d4c581eb3ec3ed/build-end.log



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>