Rename _rpmdbMatchIterator -> rpmdbMatchIterator_s

- consistency with other similar constructs

lib/rpmlib.h

@@ -75,7 +75,7 @@ typedef struct rpmdb_s * rpmdb;
 /** \ingroup rpmdb
  * Database iterator.
  */
-typedef struct _rpmdbMatchIterator * rpmdbMatchIterator;
+typedef struct rpmdbMatchIterator_s * rpmdbMatchIterator;
 
 /** \ingroup rpmgi
  * Generalized iterator.

rpmdb/rpmdb.c

@@ -587,7 +587,7 @@ typedef struct miRE_s {
     int			fnflags;	/*!< fnmatch(3) flags */
 } * miRE;
 
-struct _rpmdbMatchIterator {
+struct rpmdbMatchIterator_s {
     rpmdbMatchIterator	mi_next;
     const void *	mi_keyp;
     size_t		mi_keylen;