Change thread.h to thread-inl.h for missing Thread::Current for x86

Change-Id: I83ff019626b284edc8cf7232594f28472d8d9e5b
diff --git a/runtime/arch/x86/thread_x86.cc b/runtime/arch/x86/thread_x86.cc
index 42789cb..39bad58 100644
--- a/runtime/arch/x86/thread_x86.cc
+++ b/runtime/arch/x86/thread_x86.cc
@@ -21,7 +21,7 @@
 
 #include "asm_support_x86.h"
 #include "base/macros.h"
-#include "thread.h"
+#include "thread-inl.h"
 #include "thread_list.h"
 
 #if defined(__APPLE__)