Restructure Arduino.h a bit to help eclipse code indexer

cores/esp32/Arduino.h

@@ -20,10 +20,6 @@
 #ifndef Arduino_h
 #define Arduino_h
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdarg.h>
@@ -105,8 +101,6 @@ extern "C" {
 #define _NOP() do { __asm__ volatile ("nop"); } while (0)
 #endif
 
-typedef unsigned int word;
-
 #define bit(b) (1UL << (b))
 #define _BV(b) (1UL << (b))
 
@@ -125,14 +119,23 @@ typedef unsigned int word;
 
 typedef bool boolean;
 typedef uint8_t byte;
+typedef unsigned int word;
+
+void setup(void);
+void loop(void);
+
+long random(long, long);
+void randomSeed(unsigned long);
+long map(long, long, long, long, long);
+
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 void init(void);
 void initVariant(void);
 void initArduino(void);
 
-void setup(void);
-void loop(void);
-
 unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout);
 unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout);
 
@@ -170,10 +173,6 @@ extern "C" void configTime(long gmtOffset_sec, int daylightOffset_sec,
 long random(long);
 #endif /* __cplusplus */
 
-long random(long, long);
-void randomSeed(unsigned long);
-long map(long, long, long, long, long);
-
 #ifndef _GLIBCXX_VECTOR
 // arduino is not compatible with std::vector
 #define min(a,b) ((a)<(b)?(a):(b))
@@ -182,6 +181,7 @@ long map(long, long, long, long, long);
 
 #define _min(a,b) ((a)<(b)?(a):(b))
 #define _max(a,b) ((a)>(b)?(a):(b))
+
 #include "pins_arduino.h"
 
 #endif /* _ESP32_CORE_ARDUINO_H_ */