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

[Evgeniy Stepanov]

Could you please do this with less code duplication? 
Like SUBDIRS=xxx
if (PPC64) SUBDIRS=$SUBDIRS yyy
for tree in $SUBDIRS

and the same with build targets.


http://reviews.llvm.org/D10033

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