add some libtool usage in openzap build. This will require re-bootstrap and configure

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@534 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/openzap/src/detect_dtmf.c

@@ -16,7 +16,7 @@ int main(int argc, char *argv[])
 	teletone_dtmf_detect_init (&dtmf_detect, 8000);
 
 	if ((fd = open(argv[1], O_RDONLY)) < 0) {
-		fprintf(stderr, "File Error!\n", strerror(errno));
+		fprintf(stderr, "File Error! [%s]\n", strerror(errno));
 		exit(-1);
 	}
 
@@ -28,5 +28,6 @@ int main(int argc, char *argv[])
 		}
 	}
 	close(fd);
+	return 0;
 }