[x/blog] blog: skip test on slow aix-ppc64 builder
[x/blog] blog: skip test on slow aix-ppc64 builder

Updates golang/go#33940

Change-Id: Ie6592612e77c91eaa8742046b8b54199ed934909
Reviewed-on: https://go-review.googlesource.com/c/blog/+/192323
Run-TryBot: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
X-Blog-Commit: 31c07df3d1a7a62665a589cdda84410f2561c080

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website