Add comRaise/LowerRTS functinos for Win32.

Need a *nix implementation now.

src/comio/comio.h

@@ -120,6 +120,8 @@ COMIOEXPORT BOOL		COMIOCALL comSetBaudRate(COM_HANDLE, ulong rate);
 COMIOEXPORT int			COMIOCALL comGetModemStatus(COM_HANDLE);
 COMIOEXPORT int			COMIOCALL comRaiseDTR(COM_HANDLE);
 COMIOEXPORT int			COMIOCALL comLowerDTR(COM_HANDLE);
+COMIOEXPORT int			COMIOCALL comRaiseRTS(COM_HANDLE);
+COMIOEXPORT int			COMIOCALL comLowerRTS(COM_HANDLE);
 COMIOEXPORT BOOL		COMIOCALL comWriteByte(COM_HANDLE, BYTE);
 COMIOEXPORT int			COMIOCALL comWriteBuf(COM_HANDLE, const BYTE*, size_t buflen);
 COMIOEXPORT int			COMIOCALL comWriteString(COM_HANDLE, const char*);

src/comio/comio_win32.c

@@ -132,6 +132,16 @@ BOOL COMIOCALL comLowerDTR(COM_HANDLE handle)
 	return EscapeCommFunction(handle, CLRDTR);
 }
 
+BOOL COMIOCALL comRaiseRTS(COM_HANDLE handle)
+{
+	return EscapeCommFunction(handle, SETRTS);
+}
+
+BOOL COMIOCALL comLowerRTS(COM_HANDLE handle)
+{
+	return EscapeCommFunction(handle, CLRRTS);
+}
+
 BOOL COMIOCALL comWriteByte(COM_HANDLE handle, BYTE ch)
 {
 	DWORD wr=0;