Limit VDDK plugin to i386 and x86-64.

These are the only architectures for which VMware provides
this library.

nbdkit.spec

@@ -385,6 +385,7 @@ Requires:       %{name}%{?_isa} = %{version}-%{release}
 This package lets you write Tcl plugins for %{name}.
 
 
+%ifarch %{ix86} x86_64
 %package plugin-vddk
 Summary:        VMware VDDK plugin for %{name}
 License:        BSD
@@ -395,6 +396,7 @@ Requires:       %{name}%{?_isa} = %{version}-%{release}
 %description plugin-vddk
 This package is a plugin for %{name} which connects to
 VMware VDDK for accessing VMware disks and servers.
+%endif
 
 
 %package plugin-xz
@@ -554,6 +556,13 @@ popd
 # Delete libtool crap.
 find $RPM_BUILD_ROOT -name '*.la' -delete
 
+# Delete the VDDK plugin on !x86 architectures since it is not
+# applicable there.
+%ifnarch %{ix86} x86_64
+rm $RPM_BUILD_ROOT%{_libdir}/%{name}/plugins/nbdkit-vddk-plugin.so
+rm $RPM_BUILD_ROOT%{_mandir}/man1/nbdkit-vddk-plugin.1*
+%endif
+
 
 %check
 # Workaround for broken libvirt (RHBZ#1138604).
@@ -730,11 +739,13 @@ popd
 %{_mandir}/man3/nbdkit-tcl-plugin.3*
 
 
+%ifarch %{ix86} x86_64
 %files plugin-vddk
 %doc README
 %license LICENSE
 %{_libdir}/%{name}/plugins/nbdkit-vddk-plugin.so
 %{_mandir}/man1/nbdkit-vddk-plugin.1*
+%endif
 
 
 %files plugin-xz
@@ -794,7 +805,7 @@ popd
 
 %changelog
 * Tue Jul 24 2018 Richard W.M. Jones <rjones@redhat.com> - 1.5.1-2
-- Enable VDDK plugin.
+- Enable VDDK plugin on x86-64 only.
 
 * Fri Jul 20 2018 Richard W.M. Jones <rjones@redhat.com> - 1.5.1-1
 - New upstream version 1.5.1.