Only build against ansible-core

We want the newest ansible-test, and we may add other macros that
require the newest version. The generated runtime Requires remain the
same.

ansible-generator

@@ -38,6 +38,8 @@ def main():
                     f"ansible-collection({info['namespace']}.{info['name']}) = {info['version']}"
                 )
             if args.action == "requires":
+                # Require either ansible-core or a version of ansible 2.9 that
+                # supports collections but prefer ansible-core.
                 print("(ansible-core or (ansible < 2.10.0 with ansible >= 2.9.10))")
                 for dep, req in info.get("dependencies", {}).items():
                     print(f"ansible-collection({dep})", end="")

ansible-packaging.spec

@@ -11,9 +11,9 @@ Source2:        macros.ansible
 Source3:        macros.ansible-srpm
 Source4:        COPYING
 
-# Require either ansible-core or a version of ansible 2.9 that supports collections but prefer ansible-core.
-Requires:       (ansible-core or (ansible < 2.10.0 with ansible >= 2.9.10))
-Suggests:       ansible-core
+# Require ansible-core for building. Collections still have a boolean runtime
+# dependency on either ansible 2.9 OR ansible-core.
+Requires:       ansible-core
 
 Requires:       ansible-srpm-macros = %{version}-%{release}
 

ansible.attr

@@ -1,4 +1,6 @@
 %__ansible_provides %{_rpmconfigdir}/ansible-generator --provides
 %__ansible_requires %{_rpmconfigdir}/ansible-generator --requires
+# Prefer ansible-core over ansible. This shells out to echo instead of using a
+# parametric dependency generator to support EL 8.
 %__ansible_suggests /usr/bin/echo ansible-core
 %__ansible_path ^%{_datadir}/ansible/collections/ansible_collections/[^/]+/[^/]+/MANIFEST.json$