enforce #ifndef __HEADER_H instead of #pragma once, for code consitency and better portability (#2296)

firmware/common/backlight.hpp

@@ -19,7 +19,8 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#pragma once
+#ifndef __BACKLIGHT_H
+#define __BACKLIGHT_H
 
 #include <cstdint>
 
@@ -118,3 +119,5 @@ class BacklightCAT4004 : public BacklightBase {
 };
 
 } /* namespace portapack */
+
+#endif

firmware/common/buffer_exchange.hpp

@@ -19,7 +19,8 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#pragma once
+#ifndef __BUFFER_EXCHANGE_H
+#define __BUFFER_EXCHANGE_H
 
 #include "ch.h"
 
@@ -110,3 +111,5 @@ class BufferExchange {
 
     StreamBuffer* get_prefill(FIFO<StreamBuffer*>* fifo);
 };
+
+#endif

firmware/common/i2cdev_ppmod.hpp

@@ -19,7 +19,8 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#pragma once
+#ifndef __I2CDEV_PPMOD_H
+#define __I2CDEV_PPMOD_H
 
 #include <cstdint>
 #include <array>
@@ -71,3 +72,5 @@ class I2cDev_PPmod : public I2cDev {
 };
 
 } /* namespace i2cdev */
+
+#endif

firmware/common/random.hpp

@@ -19,7 +19,8 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#pragma once
+#ifndef __RANDOM_H
+#define __RANDOM_H
 
 /* Period parameters */
 #define N 624
@@ -33,3 +34,5 @@
 /* initializes state[N] with a seed */
 extern void init_genrand(unsigned long s);
 extern long genrand_int31(void);
+
+#endif