Add header forgotten in 213335c

Report from Peter Eisentraut

Author: feodor

src/backend/utils/adt/tsvector_op.c

@@ -21,6 +21,7 @@
 #include "funcapi.h"
 #include "mb/pg_wchar.h"
 #include "miscadmin.h"
+#include "parser/parse_coerce.h"
 #include "tsearch/ts_utils.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"