[PATCH] Do not build libsanitizer also for powerpc*-*-linux*

[Arseny Solokha]

Recent changes in GetPcSpBp() (libsanitizer/asan/asan_linux.cc) made it
impossible to build 4.10.0-alpha20140525 snapshot for powerpc targets. The
proposed patch disables building libsanitizer for powerpc*-*-linux* in addition
to already disabled powerpc*le-*-linux* until the smarter solution will emerge.

The actual issue preventing ASAN from porting to PPC seems to be inability to
retrieve values of PC and BP on this architecture.
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