[PATCH] Add a copy of missing <ucontext.h> for Android and enable ASan SEGV handler.

[Evgeniy Stepanov]

Hi kcc, glider, samsonov,

This change enables ASan SEGV handler by default on Android (as is already done on other platforms).
It also enables AddressSanitizer.WildAddressAccess on Android, which now passes.


http://llvm-reviews.chandlerc.com/D2729

Files:
  third_party/android/LICENSE.TXT
  third_party/android/include/sys/ucontext.h
  third_party/android/include/ucontext.h
  third_party/android/README.LLVM
  lib/asan/tests/CMakeLists.txt
  lib/asan/asan_linux.cc
  lib/asan/CMakeLists.txt
  lib/sanitizer_common/CMakeLists.txt
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