AP_Mount: example fix travis warning

missing function declaration
implicit cast
some style fix

libraries/AP_Module/examples/ModuleTest/ModuleTest.cpp

@@ -7,6 +7,9 @@
 #include <AP_HAL/AP_HAL.h>
 #include <AP_Module/AP_Module.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 // sensor declaration

libraries/AP_Mount/examples/trivial_AP_Mount/trivial_AP_Mount.cpp

@@ -27,6 +27,9 @@
 
 #include <AP_Mount/AP_Mount.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 void setup () {