AP_HAL: fixed argv declaration to match getopt()

libraries/AP_HAL/HAL.h

@@ -42,7 +42,7 @@ public:
         scheduler(_scheduler)
     {}
 
-    virtual void init(int argc, const char *argv[]) const = 0;
+    virtual void init(int argc, char * const argv[]) const = 0;
 
     AP_HAL::UARTDriver* uartA;
     AP_HAL::UARTDriver* uartB;

libraries/AP_HAL_AVR/HAL_AVR.cpp

@@ -2,7 +2,7 @@
 #include "HAL_AVR.h"
 using namespace AP_HAL_AVR;
 
-void HAL_AVR::init(int argc, const char *argv[]) const {
+void HAL_AVR::init(int argc, char * const argv[]) const {
 
     scheduler->init((void*)&isr_registry);
    

libraries/AP_HAL_AVR/HAL_AVR.h

@@ -31,7 +31,7 @@ public:
                         _console, _gpio, _rcin,
                         _rcout, _scheduler) {}
 
-    void init(int argc, const char *argv[]) const;
+    void init(int argc, char * const argv[]) const;
     AP_HAL_AVR::ISRRegistry isr_registry;
 };
 #endif // __AP_HAL_AVR_HAL_AVR_H__

libraries/AP_HAL_AVR/HAL_AVR_APM1_Class.cpp

@@ -50,7 +50,7 @@ HAL_AVR_APM1::HAL_AVR_APM1() :
         &avrScheduler )
 {}
 
-void HAL_AVR_APM1::init(int argc, const char *argv[]) const {
+void HAL_AVR_APM1::init(int argc, char * const argv[]) const {
 
     scheduler->init((void*)&isrRegistry);
    

libraries/AP_HAL_AVR/HAL_AVR_APM1_Class.h

@@ -20,7 +20,7 @@
 class HAL_AVR_APM1 : public AP_HAL::HAL {
 public:
     HAL_AVR_APM1();
-    void init(int argc, const char *argv[]) const;
+    void init(int argc, char * const argv[]) const;
 };
 
 /**

libraries/AP_HAL_AVR/HAL_AVR_APM2_Class.cpp

@@ -49,7 +49,7 @@ HAL_AVR_APM2::HAL_AVR_APM2() :
         &avrScheduler )
 {}
 
-void HAL_AVR_APM2::init(int argc, const char *argv[]) const {
+void HAL_AVR_APM2::init(int argc, char * const argv[]) const {
 
     scheduler->init((void*)&isrRegistry);
    

libraries/AP_HAL_AVR/HAL_AVR_APM2_Class.h

@@ -20,7 +20,7 @@
 class HAL_AVR_APM2 : public AP_HAL::HAL {
 public:
     HAL_AVR_APM2();
-    void init(int argc, const char *argv[]) const;
+    void init(int argc, char * const argv[]) const;
 };
 
 /**