[CTRACER]: Avoid comparing DW_TAG_subprogram with DW_AT_abstract_origin

See d0e47a6f2c commit.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

ctracer.c

@@ -35,6 +35,7 @@ static struct tag *function__filter(struct tag *tag, struct cu *cu, void *cookie
 
 	function = tag__function(tag);
 	if (function__inlined(function) ||
+	    function->abstract_origin != 0 ||
 	    !ftype__has_parm_of_type(&function->proto, cookie, cu))
 		return NULL;