Fix some warnings from current Apple clang

- remove some unused vars
- remove use of std::mem_fn / std::bind2nd

src/Input/FGEventInput.cxx

@@ -537,9 +537,6 @@ bool FGReportSetting::Test()
     return d;
 }
 
-static const char* hexTable = "0123456789ABCDEF";
-
-
 std::string FGReportSetting::reportBytes(const std::string& moduleName) const
 {
     FGNasalSys *nas = globals->get_subsystem<FGNasalSys>();
@@ -576,7 +573,8 @@ std::string FGReportSetting::reportBytes(const std::string& moduleName) const
       // can't access FGInputDevice here to check debugEvents flag
 #if 0
       std::ostringstream byteString;
-      
+      static const char* hexTable = "0123456789ABCDEF";
+
         for (int i=0; i<s.size(); ++i) {
             uint8_t uc = static_cast<uint8_t>(s[i]);
             byteString << hexTable[uc >> 4];

src/Scenery/SceneryPager.cxx

@@ -110,8 +110,9 @@ void SceneryPager::signalEndFrame()
     }
     if (!_pagerRequests.empty()) {
         arePagerRequests = true;
-        for_each(_pagerRequests.begin(), _pagerRequests.end(),
-                 bind2nd(mem_fun_ref(&PagerRequest::doRequest), this));
+        for (auto req : _pagerRequests) {
+            req.doRequest(this);
+        }
         _pagerRequests.clear();
     }
     if (areDeleteRequests && !arePagerRequests) {

src/Scripting/NasalPositioned_cppbind.cxx

@@ -108,7 +108,9 @@ std::vector<T> extract( const std::vector<C1>& in,
                         T (C2::*getter)() const )
 {
   std::vector<T> ret(in.size());
-  std::transform(in.begin(), in.end(), ret.begin(), std::mem_fun(getter));
+  std::transform(in.begin(), in.end(), ret.begin(), [getter](const C1& c)
+                 { return (c->*getter)(); }
+                 );
   return ret;
 }
 

src/Scripting/NasalSys.cxx

@@ -219,15 +219,12 @@ static void f_timerObj_setSimTime(TimerObj& timer, naContext c, naRef value)
 class TimeStampObj : public SGReferenced
 {
 public:
-    TimeStampObj(Context *c, FGNasalSys* sys) :
-        _sys(sys)
+    TimeStampObj(Context *c)
     {
         timestamp.stamp();
     }
 
-    virtual ~TimeStampObj()
-    {
-    }
+    virtual ~TimeStampObj() = default;
 
     void stamp()
     {
@@ -243,7 +240,6 @@ public:
     }
 private:
     SGTimeStamp timestamp;
-    FGNasalSys* _sys;
 };
 
 typedef SGSharedPtr<TimeStampObj> TimeStampObjRef;
@@ -600,7 +596,7 @@ static naRef f_makeTimer(naContext c, naRef me, int argc, naRef* args)
 
 static naRef f_maketimeStamp(naContext c, naRef me, int argc, naRef* args)
 {
-    TimeStampObj* timeStampObj = new TimeStampObj(c, nasalSys);
+    TimeStampObj* timeStampObj = new TimeStampObj(c);
     return nasal::to_nasal(c, timeStampObj);
 }