Problem: build on SUSE Leap 15 broken

Solution: ignore post-build checks:

[   87s] I: Program is likely to break with new gcc. Try -fno-strict-aliasing.
[   87s] W: python-pyzmq strict-aliasing-punning zmq/backend/cython/_poll.c:3207, 3210
[   87s] W: python-pyzmq strict-aliasing-punning zmq/backend/cython/context.c:2803
[   87s] W: python-pyzmq strict-aliasing-punning zmq/backend/cython/message.c:1691, 1712, 4516
[   87s] W: python-pyzmq strict-aliasing-punning zmq/backend/cython/socket.c:1594, 1652, 1685, 7947
[   87s] W: python-pyzmq strict-aliasing-punning zmq/backend/cython/utils.c:839
[   87s]
[   87s] I: Program returns random data in a function
[   87s] E: python-pyzmq no-return-in-nonvoid-function /tmp/timer_create94hLI9.c:3
[   87s] E: python-pyzmq no-return-in-nonvoid-function /tmp/timer_createpxvysoje.c:3

packaging/redhat/python-pyzmq.spec

@@ -53,6 +53,7 @@ BuildRequires:  %{python_module Cython}
 BuildRequires:  %{python_module cffi}
 BuildRequires:  %{python_module py}
 BuildRequires:  zeromq-devel
+BuildRequires:  -post-build-checks
 Requires:       python
 %if 0%{?centos_version} == 0 && 0%{?rhel_version} == 0
 Recommends:     python-cffi