[ASAN] disable fgets_fputs test for android and darwin
aarch64/aosp_marlin-userdebug/OPR4.170623.016] builder unexpectedly
failed the fgets test (`assertion "fp" failed`). macOS unexpectedly
passes the fputs test without triggering ASAN.
// RUN: not %run %t 1 %t-testdata 2>&1 | FileCheck %s --check-prefix=CHECK-FGETS
// RUN: not %run %t 2 2>&1 | FileCheck %s --check-prefix=CHECK-FPUTS
// RUN: not %run %t 3 2>&1 | FileCheck %s --check-prefix=CHECK-PUTS
+// XFAIL: android, darwin
#include <assert.h>
#include <stdio.h>
