[asan] Fix unsupported test on Android
Summary:
`pvalloc` appears to not be available on Android. Mark the failing test as
unsupported on that platform.
Reviewers: alekseyshl, vitalybuka
Subscribers: srhines, kubamracek, llvm-commits
// RUN: ASAN_OPTIONS=allocator_may_return_null=0 not %run %t psm1 2>&1 | FileCheck %s
// RUN: ASAN_OPTIONS=allocator_may_return_null=1 %run %t psm1 2>&1
-// UNSUPPORTED: freebsd
+// UNSUPPORTED: freebsd, android
// Checks that pvalloc overflows are caught. If the allocator is allowed to
// return null, the errno should be set to ENOMEM.
