Lose HAVE_ANDROID_OS in frameworks/rs.

Change-Id: Iba57869192ba9b1fde995ff0e48b7a28b2cb122f
diff --git a/rsDriverLoader.cpp b/rsDriverLoader.cpp
index 125a6df..22868e5 100644
--- a/rsDriverLoader.cpp
+++ b/rsDriverLoader.cpp
@@ -37,7 +37,7 @@
 #include <unistd.h>
 
 #if !defined(RS_SERVER) && !defined(RS_COMPATIBILITY_LIB) && \
-        defined(HAVE_ANDROID_OS)
+        defined(__ANDROID__)
 #include <cutils/properties.h>
 #endif