ART: Use __ANDROID__ instead of HAVE_ANDROID_OS

Use the proper define.

Change-Id: I71e291ac25f5d5f0187ac9b6ef2d6872f19e6085
diff --git a/runtime/thread.cc b/runtime/thread.cc
index 2b977af..b3efad0 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -2139,7 +2139,7 @@
   std::string str(ss.str());
   // log to stderr for debugging command line processes
   std::cerr << str;
-#ifdef HAVE_ANDROID_OS
+#ifdef __ANDROID__
   // log to logcat for debugging frameworks processes
   LOG(INFO) << str;
 #endif