Add missing Config.h (for USE_MCJIT)

Change-Id: I4defab3a1ac07aaab9720e628bc86f678688aed4
diff --git a/lib/ExecutionEngine/ScriptCached.cpp b/lib/ExecutionEngine/ScriptCached.cpp
index da32ad0..7c3ad1f 100644
--- a/lib/ExecutionEngine/ScriptCached.cpp
+++ b/lib/ExecutionEngine/ScriptCached.cpp
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include "Config.h"
+
 #include "ScriptCached.h"
 
 #include <bcc/bcc_cache.h>