roseCheckNfaEod: use sparse iterator for EOD

Rather than checking all active outfix/suffix engines, use a sparse
iterator to check only those engines that accept at EOD.

src/rose/rose_internal.h

@@ -428,6 +428,9 @@ struct RoseEngine {
     u32 eodIterProgramOffset; // or 0 if no eod iterator program
     u32 eodIterOffset; // offset to EOD sparse iter or 0 if none
 
+    /** \brief Offset to sparse iter over outfix/suffix NFAs that accept EOD. */
+    u32 eodNfaIterOffset;
+
     u32 lastByteHistoryIterOffset; // if non-zero
 
     /** \brief Minimum number of bytes required to match. */