Only build rpm for arm64 and amd64

We don't support all the arch so only build for supported one.

- http://ftp.rpm.org/max-rpm/s1-rpm-multi-platform-dependent-tags.html

crc-admin-helper.spec.in

@@ -29,6 +29,7 @@ Name:           %{goname}
 Release:        1%{?dist}
 Summary:        CRC's helper with administrative privileges
 License:        MIT
+ExclusiveArch:  x86_64 aarch64
 URL:            %{gourl}
 Source0:        %{gosource}