Fix "-O0" build.

Change-Id: If0558b1a6bf35913d730e274d5819aaacb1fe21f
diff --git a/src/oat/runtime/context.cc b/src/oat/runtime/context.cc
index 998e762..3073377 100644
--- a/src/oat/runtime/context.cc
+++ b/src/oat/runtime/context.cc
@@ -16,8 +16,11 @@
 
 #include "context.h"
 
+#if defined(__arm__)
 #include "arm/context_arm.h"
+#else
 #include "x86/context_x86.h"
+#endif
 
 namespace art {