net-libs/zeromq: remove outdated -j1 workaround

Tests run fine with parallelism these days.

Bug: https://bugs.gentoo.org/468748
Bug: https://bugs.gentoo.org/597808
Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>

net-libs/zeromq/zeromq-4.3.5-r1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -61,13 +61,6 @@ src_configure() {
 	CONFIG_SHELL="${BROOT}"/bin/bash econf "${myeconfargs[@]}"
 }
 
-src_test() {
-	# Restricting to one job because multiple tests are using the same port.
-	# Upstream knows the problem and says it doesn't support parallel test
-	# execution, see ${S}/INSTALL.
-	emake -j1 check
-}
-
 src_install() {
 	default
 	find "${ED}" -type f -name '*.la' -delete || die