[asan] Enable signal and sigaction interceptors on Android.

Fixes AddressSanitizer.SignalTest breakage.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201330 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] Remove extra clone() arguments in test.

Android headers define clone() as a 4-argument function without ellipsis.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201331 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] Disable 1 test on Android.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201332 91177308-0d34-0410-b5e6-96231b3b80d8