add support for 115200 baud

--- xc-4.3.2/xcport.c
+++ xc-4.3.2/xcport.c
@@ -107,6 +107,7 @@
 	{"38400",38400,B38400},
 	{"57600",57600,B50},
 #endif
+	{"115200",115200,B115200},
 	{"0", 0, B0}
 };
 
