runtime port identification

The CE ports use makedefs hosted on another platform,
so the version string generated at build time isn't really
appropriate.

Add a way to add information to the version string
at runtime for such ports.

src/version.c

@@ -24,6 +24,9 @@ char *buf;
 	 Strcpy(buf, VERSION_ID);
 #if defined(BETA) && defined(BETA_INFO)
 	 Sprintf(eos(buf), " %s", BETA_INFO);
+#endif
+#if defined(RUNTIME_PORT_ID)
+	 append_port_id(buf);
 #endif
 	return buf;
 }