Temporarily disable the build on i686

This should let us to get the Python 3.7 rebuild done on other arches at
least.

libreoffice.spec

@@ -68,6 +68,8 @@ Release:        1%{?libo_prerelease}%{?dist}
 License:        (MPLv1.1 or LGPLv3+) and LGPLv3 and LGPLv2+ and BSD and (MPLv1.1 or GPLv2 or LGPLv2 or Netscape) and Public Domain and ASL 2.0 and MPLv2.0 and CC0
 URL:            http://www.libreoffice.org/
 
+ExcludeArch:    %{ix86}
+
 Source0:        %{source_url}/libreoffice-%{version}%{?libo_prerelease}%{?libo_buildfix}.tar.xz
 Source1:        %{source_url}/libreoffice-%{version}%{?libo_prerelease}%{?libo_buildfix}.tar.xz.asc
 Source2:        %{source_url}/libreoffice-help-%{version}%{?libo_prerelease}%{?libo_buildfix}.tar.xz