spec: disable debug info

No debug information is produced. We need to disable debug info
collection to avoid:
error: Empty %files file /builddir/build/BUILD/ansible-pylibssh-1.1.1rc1.dev49+ge411627/debugsourcefiles.list

Author: pbrezina

packaging/rpm/ansible-pylibssh.spec

@@ -17,6 +17,8 @@
 
 %global buildroot_site_packages "%{buildroot}%{python3_sitearch}"
 
+%global debug_package %{nil}
+
 Name:    python-%{pypi_name}
 Version: %{upstream_version}
 Release: 1%{?dist}