mkosi: Disable rpm package notes

This introduces dependencies on various environment variables set
by rpmbuild which will not be set when rerunning meson inside the
VM/container so let's disable package notes to avoid these dependencies,
as the package notes aren't terribly useful in this scenario anyway.

mkosi.images/system/mkosi.conf.d/10-centos-fedora/mkosi.build.chroot

@@ -74,6 +74,7 @@ ANNOBIN="no-active-checks" rpmbuild \
     --define "_find_debuginfo_dwz_opts %{nil}" \
     --define "_fortify_level 0" \
     --undefine _lto_cflags \
+    --undefine _package_note_flags \
     --noclean \
     "pkg/$ID/systemd.spec"