error: new disabled hashing error code

Add new error code to be used when something fails due to hashing being
disabled.

src/util-error.c

@@ -377,6 +377,7 @@ const char * SCErrorToString(SCError err)
         CASE_CODE (SC_ERR_PLUGIN);
         CASE_CODE(SC_ERR_LOG_OUTPUT);
         CASE_CODE(SC_ERR_RULE_INVALID_UTF8);
+        CASE_CODE(SC_ERR_HASHING_DISABLED);
 
         CASE_CODE (SC_ERR_MAX);
     }

src/util-error.h

@@ -367,6 +367,7 @@ typedef enum {
     SC_ERR_PLUGIN,
     SC_ERR_LOG_OUTPUT,
     SC_ERR_RULE_INVALID_UTF8,
+    SC_ERR_HASHING_DISABLED,
 
     SC_ERR_MAX
 } SCError;