Use the icu4c headers from the new location.

Change-Id: I6ca56e8f9909bf3644a5f79f2d705547ddba6d03
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index fdbc9c2..289dc1d 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -26,7 +26,7 @@
 #include <fstream>
 #include <memory>
 
-#include "../../external/icu4c/common/unicode/uvernum.h"
+#include "../../external/icu/icu4c/source/common/unicode/uvernum.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/stringprintf.h"