libtasn1.h.in: merge asn1_static_node definition for gtk-doc

Gtk-doc fails to find asn1_static_node fields documentation. Merge
struct asn1_static_node_st with typedef asn1_static_node to let Gtk-doc
find the documentation.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
diff --git a/lib/includes/libtasn1.h.in b/lib/includes/libtasn1.h.in
index 4889e7b..f2bc106 100644
--- a/lib/includes/libtasn1.h.in
+++ b/lib/includes/libtasn1.h.in
@@ -203,13 +203,12 @@
  *
  * For the on-disk format of ASN.1 trees, created by asn1_parser2array().
  */
-struct asn1_static_node_st
+typedef struct asn1_static_node_st
 {
   const char *name;		/* Node name */
   unsigned int type;		/* Node type */
   const void *value;		/* Node value */
-};
-typedef struct asn1_static_node_st asn1_static_node;
+} asn1_static_node;
 
 /* List of constants for field type of node_asn  */
 #define ASN1_ETYPE_INVALID        0