Remove unused includes of gpio.h

rigs/gomspace/gs100.c

@@ -34,7 +34,6 @@
 #include "hamlib/rig.h"
 #include "serial.h"
 #include "parallel.h"
-#include "gpio.h"
 #include "misc.h"
 #include "tones.h"
 #include "idx_builtin.h"

src/iofunc.c

@@ -50,7 +50,6 @@
 #include "usb_port.h"
 #include "network.h"
 #include "cm108.h"
-#include "gpio.h"
 #include "asyncpipe.h"
 
 #if defined(WIN32) && defined(HAVE_WINDOWS_H)