updated for version 7.4.673

Problem:    The first syntax entry gets sequence number zero, which doesn't
            work. (Clinton McKay)
Solution:   Start at number one. (Bjorn Linse)

src/syntax.c

@@ -311,7 +311,7 @@ typedef struct state_item
 				       but contained groups */
 
 #ifdef FEAT_CONCEAL
-static int next_seqnr = 0;		/* value to use for si_seqnr */
+static int next_seqnr = 1;		/* value to use for si_seqnr */
 #endif
 
 /*

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    673,
 /**/
     672,
 /**/