Remove RPM package restriction

ZFS on Linux is regularly tested on arm, ppc, ppc64, i686 and x86_64
architectures.  Given this the artificial architecture restriction in
the packaging has been removed.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

rpm/generic/zfs.spec.in

@@ -68,11 +68,6 @@ License:        @ZFS_META_LICENSE@
 URL:            http://zfsonlinux.org/
 Source0:        %{name}-%{version}.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-ExclusiveArch:  i386 i686 x86_64
-
-# May build but untested on ppc/ppc64
-ExcludeArch:    ppc ppc64
-
 Requires:       spl = %{version}
 Requires:       libzpool2 = %{version}
 Requires:       libnvpair1 = %{version}