RFS server fix for serial connections

On Linux, the serial connection was not setup properly, which led to
weird errors in the RFS server. This fix disables any input processing
in the termios layer, thus fixing the problem. Thanks to Markus Korber
for reporting and fixing the issue.

rfs_server_src/serial_posix.c

@@ -112,6 +112,9 @@ int ser_setup( ser_handler id, u32 baud, int databits, int parity, int stopbits,
   termdata.c_iflag &= ~( IXON | IXOFF | IXANY );
   termdata.c_iflag |= IGNBRK;
 
+  // Disable input processing
+  termdata.c_iflag &= ~( INLCR | ICRNL | IGNCR );
+
   // Raw input
   termdata.c_lflag &= ~( ICANON | ECHO | ECHOE | ISIG );