Generate a more easy to read filename for cached kernels

include/cpu-md5.h

@@ -0,0 +1,2 @@
+void md5_64 (uint block[16], uint digest[4]);
+

include/shared.h

@@ -2293,6 +2293,7 @@ void *thread_runtime   (void *p);
  */
 
 #include "cpu-crc32.h"
+#include "cpu-md5.h"
 
 /**
  * ciphers for use on cpu

include/types.h

@@ -875,6 +875,7 @@ struct __hc_device_param
   // device specific attributes starting
 
   char             *device_name;
+  char             *device_name_chksum;
   char             *device_version;
   char             *driver_version;