Exclude i686 architecture

This package depends on python3-xattr, which is archful and
excludes i686. Thus, this package has to do the same, in order to
avoid getting assigned to i686 builder in Koji and failing due to
the missing dependency.

yle-dl.spec

@@ -8,6 +8,9 @@ URL:            https://aajanki.github.io/yle-dl/index-en.html
 Source:         https://github.com/aajanki/%{name}/archive/%{version}/%{name}-%{version}.tar.gz
 
 BuildArch:      noarch
+# Depends on archful python3-xattr which excludes i686
+ExcludeArch:    %{ix86}
+
 BuildRequires:  python3-devel
 Requires:       /usr/bin/ffmpeg
 # According to README, needed "optionally for few rare streams".