[asan] Disable fakestack_alignment.ll test for Android

This test, introduced in
457b14c,
breaks the Android build bot (https://lab.llvm.org/buildbot/#/builders/186/builds/11522).

ASan on Android has been deprecated in favor of HWASan
(https://source.android.com/docs/security/test/asan), so disable this
test.

Author: thurstond

compiler-rt/test/asan/TestCases/Posix/fakestack_alignment.cpp

@@ -17,6 +17,8 @@
 // RUN: %clangxx_asan -pthread -fsanitize-address-use-after-return=always -O0 -DALIGNMENT=8192  -DTHREAD_COUNT=32 -DTHREAD_STACK_SIZE=131072 %s -o %t && %run %t 2>&1
 // RUN: %clangxx_asan -pthread -fsanitize-address-use-after-return=always -O0 -DALIGNMENT=16384 -DTHREAD_COUNT=32 -DTHREAD_STACK_SIZE=131072 %s -o %t && %run %t 2>&1
 
+// UNSUPPORTED: android
+
 #include <assert.h>
 #include <pthread.h>
 #include <stdio.h>