Change the warning about unrecognized entries in the dynamic table

to a debug message which is disabled in production builds of the
dynamic linker.  The condition warned about is normally harmless.

PR:		bin/12849

libexec/rtld-elf/rtld.c

@@ -550,8 +550,8 @@ digest_dynamic(Obj_Entry *obj)
 	    break;
 
 	default:
-	    xprintf("Ignored d_tag %d\n",dynp->d_tag);
-            break;
+	    dbg("Ignoring d_tag %d = %#x", dynp->d_tag, dynp->d_tag);
+	    break;
 	}
     }