Cleanup unused variable warning.

Remove, comment out or relocate variables as appropriate to silence
unused variable warning.

src/FDM/SP/AISim.cpp

@@ -307,7 +307,7 @@ printf("FT:   %10.2f, %7.2f, MT: %7.2f\n", FT[i][X]*th, FTM[i][X]*mach, MT[i][X]
                 simd4_t<float,3> mu_body(-0.02f-0.7f*br, 0.8f, 0.0f);
 
                 simd4_t<float,3> FLGear = mNed2Body*Fn_lg + vUVWaero*mu_body;
-                simd4_t<float,3> MLGear = simd4::cross(gear_pos[i], FLGear);
+//              simd4_t<float,3> MLGear = simd4::cross(gear_pos[i], FLGear);
 #if 0
 printf("FLGear[%i]: %10.2f %10.2f %10.2f\n",i,FLGear[0], FLGear[1], FLGear[2]);
 printf("MLGear[%i]: %10.2f %10.2f %10.2f\n",i,MLGear[0], MLGear[1], MLGear[2]);

src/Main/options.cxx

@@ -2817,6 +2817,8 @@ void Options::setupRoot(int argc, char **argv)
         SetupRootDialog::runDialog(usingDefaultRoot);
     }
 #else
+    SG_UNUSED(usingDefaultRoot);
+    
     // validate it
     if (base_version.empty()) {
         flightgear::fatalMessageBox("Base package not found",

src/Main/positioninit.cxx

@@ -447,14 +447,16 @@ static bool fgSetPosFromNAV( const string& id,
 }
 
 // Set current_options lon/lat given an aircraft carrier id
-static bool fgSetPosFromCarrier( const string& carrier, const string& posid ) {
+static bool fgSetPosFromCarrier( const string& carrier, const string& posid ) 
+{
 
+#ifndef FG_TESTLIB
+    
   // set initial position from runway and heading
   SGGeod geodPos;
   double heading;
   SGVec3d uvw;
 
-#ifndef FG_TESTLIB
   if (FGAIManager::getStartPosition(carrier, posid, geodPos, heading, uvw)) {
     double lon = geodPos.getLongitudeDeg();
     double lat = geodPos.getLatitudeDeg();

src/MultiPlayer/multiplaymgr.cxx

@@ -1677,8 +1677,7 @@ FGMultiplayMgr::ProcessPosMsg(const FGMultiplayMgr::MsgBuf& Msg,
    // strict about the validity of the property values.
    const xdr_data_t* xdr = Msg.properties();
    const xdr_data_t* data = xdr;
-    int MsgLenBytes = Msg.Header.MsgLen;
-
+   
     /*
      * with V2 we use the pad to forcefully invoke older clients to verify (and discard)
      * our new protocol.

src/Scripting/NasalPositioned.cxx

@@ -993,9 +993,10 @@ static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
 
   naRef vec = naNewVector(c);
   naVec_append(vec, naNum(elev));
-  naRef matdata = naNil();
 
 #ifndef FG_TESTLIB
+  naRef matdata = naNil();
+  
   const SGMaterial *mat = dynamic_cast<const SGMaterial *>(material);
   if(mat) {
     matdata = naNewHash(c);