[ps2,terminal_usb] Quick fix for build problem

protocol.mk

@@ -15,11 +15,13 @@ endif
 
 ifdef PS2_USE_INT
     SRC += protocol/ps2_interrupt.c
+    SRC += protocol/ps2_io_avr.c
     OPT_DEFS += -DPS2_USE_INT
 endif
 
 ifdef PS2_USE_USART
     SRC += protocol/ps2_usart.c
+    SRC += protocol/ps2_io_avr.c
     OPT_DEFS += -DPS2_USE_USART
 endif
 

protocol/ps2_io_avr.c

@@ -1,4 +1,5 @@
 #include <stdbool.h>
+#include <avr/io.h>
 #include <util/delay.h>
 
 /* Check port settings for clock and data line */