Cleaning up the serialization change.
Renaming the define to be more in line with what it does and removing the host stub header file.

Change-Id: Ibd3a0a6a398c7f81cc661f71e4478707fe1679ed
diff --git a/libs/rs/rsUtils.h b/libs/rs/rsUtils.h
index 0699b57..3b60af5 100644
--- a/libs/rs/rsUtils.h
+++ b/libs/rs/rsUtils.h
@@ -32,7 +32,7 @@
 #include <time.h>
 #include <cutils/atomic.h>
 
-#ifndef ANDROID_RS_BUILD_FOR_HOST
+#ifndef ANDROID_RS_SERIALIZE
 #include <EGL/egl.h>
 #endif