Fix zmq_proxy_steerable #1020

Job	Run time
cron	0s
build (x64, release, windows-2019, ON, ON, Visual Studio 16 2019, v142, vs2019, v142-x64, ON)	7m 45s
build (ubuntu-latest, default, asciidoc xmlto, disabled, select)	5m 9s
build (ubuntu-latest, default, disabled, poll)	3m 31s
build (ubuntu-latest, android, disabled)	4m 40s
build (ubuntu-latest, coverage, libkrb5-dev libnorm-dev libpgm-dev libgnutls28-dev lcov, enabled,...	4m 0s
build (ubuntu-latest, valgrind, valgrind libgnutls28-dev, enabled)	10m 39s
build (ubuntu-latest, cmake, libsodium, enabled, cmake libsodium-dev, enabled)	3m 56s
build (ubuntu-latest, cmake, enabled, cmake clang-format-11, 1)	52s
build (ubuntu-latest, default, libkrb5-dev libnorm-dev libpgm-dev libgnutls28-dev libsodium-dev l...	4m 20s
build (ubuntu-latest, default, libkrb5-dev libnorm-dev libpgm-dev libgnutls28-dev libsodium-dev l...	5m 7s
build (ubuntu-latest, default, libkrb5-dev libnorm-dev libpgm-dev libgnutls28-dev libsodium-dev l...	3m 24s
build (ubuntu-latest, abi-compliance-checker, abi-dumper abi-compliance-checker, disabled)	4m 37s
build (ubuntu-latest, cmake, clang-tidy clang-tools, enabled, clang++)	4m 32s
build (macos-latest, default, automake autoconf, enabled)	4m 37s
build (macos-latest, default, automake autoconf libsodium, libsodium, disabled)	5m 38s
	1h 12m 47s

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