[PATCH] Prevent building of libunwind, libcxx, libcxxabi, and lld on powerpc64 buildbots

[Bill Seurer]

================
Comment at: zorg/buildbot/builders/sanitizers/buildbot_functions.sh:171
@@ -157,3 +170,3 @@
       $LLVM && \
-    ninja cxx cxxabi) || echo $step_result
+    ninja) || echo $step_result
 
----------------
eugenis wrote:
> Missing ${extra_dirs} in this line?
> You probably want to skip this step completely on PPC64.
> 
Oops, yeah.  I will change this to just skip the whole thing.

http://reviews.llvm.org/D10033

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