[asan] Fix one more test on Android.

This change makes it pass both on libstdc++ and libc++-based toolchains.

The error was:
error: function-like macro '__GLIBC_PREREQ' is not defined
                               ^

llvm-svn: 335936

compiler-rt/test/sanitizer_common/TestCases/Linux/sysconf_interceptor_bypass_test.cc

@@ -1,12 +1,14 @@
 // RUN: %clangxx -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
 
-// XFAIL: android
-
 #include <stdio.h>
 
+#if !defined(__GLIBC_PREREQ)
+#define __GLIBC_PREREQ(a, b) 0
+#endif
+
 // getauxval() used instead of sysconf() in GetPageSize() is defined starting
 // glbc version 2.16.
-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 16)
+#if __GLIBC_PREREQ(2, 16)
 extern "C" long sysconf(int name) {
   fprintf(stderr, "sysconf wrapper called\n");
   return 0;