Disabled uart.c ISRs if GDBSTUB (debug emulator) is set

src/uart.c

@@ -55,6 +55,8 @@ UART_PutChar (const uint8_t c)
   return ret;
 }
 
+#ifndef GDBSTUB
+
 // Receive Interrupt Routine
 ISR(USART0_RX_vect)
 {
@@ -70,6 +72,8 @@ ISR(USART0_UDRE_vect)
     UCSR0B &= ~(1 << UDRIE0);
 }
 
+#endif
+
 int16_t
 UART_GetChar (void)
 {