detect/pcre: Add warning for failed registrations

This commit adds a warning used by the PCRE detect logic when it fails
to register initialization and free functions for per-thread JIT stack
handling.

This error code is only used when the platform has PCRE JIT exec
functionality.

src/util-error.c

@@ -367,6 +367,7 @@ const char * SCErrorToString(SCError err)
         CASE_CODE (SC_ERR_DATASET);
         CASE_CODE (SC_WARN_ANOMALY_CONFIG);
         CASE_CODE (SC_WARN_ALERT_CONFIG);
+        CASE_CODE (SC_WARN_REGISTRATION_FAILED);
 
         CASE_CODE (SC_ERR_MAX);
     }

src/util-error.h

@@ -357,6 +357,7 @@ typedef enum {
     SC_WARN_ALERT_CONFIG,
     SC_ERR_PCRE_COPY_SUBSTRING,
     SC_WARN_PCRE_JITSTACK,
+    SC_WARN_REGISTRATION_FAILED,
 
     SC_ERR_MAX
 } SCError;