Stop touching SPI and GPIOs when not running on linux

cores/portduino/linux/LinuxHardwareSPI.cpp

@@ -5,10 +5,13 @@
 #include "HardwareSPI.h"
 #include "SPIChip.h"
 #include "Utility.h"
-#include "linux/PosixFile.h"
 #include "logging.h"
 
 #include <assert.h>
+
+#ifdef PORTDUINO_LINUX_HARDWARE
+
+#include "linux/PosixFile.h"
 #include <linux/spi/spidev.h>
 
 class LinuxSPIChip : public SPIChip, private PosixFile {
@@ -69,6 +72,7 @@ class LinuxSPIChip : public SPIChip, private PosixFile {
     return 0;
   }
 };
+#endif
 
 // FIXME, this is kinda skanky, but for now we assume one SPI device
 SPIChip *spiChip;
@@ -139,13 +143,15 @@ void HardwareSPI::begin() {
   // We only do this init once per boot
   if (!spiChip) {
 
+#ifdef PORTDUINO_LINUX_HARDWARE
     // FIXME, only install the following on linux and only if we see that the
     // device exists in the filesystem
     try {
       spiChip = new LinuxSPIChip();
     } catch (...) {
       printf("No hardware spi chip found...\n");
     }
+#endif
 
     if (!spiChip) // no hw spi found, use the simulator
       spiChip = new SimSPIChip();

cores/portduino/linux/gpio/LinuxGPIOPin.cpp

@@ -1,3 +1,5 @@
+#ifdef PORTDUINO_LINUX_HARDWARE
+
 #include "linux/gpio/LinuxGPIOPin.h"
 #include <assert.h>
 #include <dirent.h>
@@ -115,3 +117,4 @@ void LinuxGPIOPin::setPinMode(PinMode m) {
 }
 
 
+#endif

cores/portduino/linux/gpio/LinuxGPIOPin.h

@@ -2,6 +2,8 @@
 // Created by kevinh on 9/1/20.
 //
 
+#ifdef PORTDUINO_LINUX_HARDWARE
+
 #include "Arduino.h"
 #include "Common.h"
 #include "PortduinoGPIO.h"
@@ -44,4 +46,4 @@ class LinuxGPIOPin : public GPIOPin {
   virtual void setPinMode(PinMode m);
 };
 
-
+#endif