Warning fixes from Gideon May.

src/osgPlugins/dw/ReaderWriterDW.cpp

@@ -415,7 +415,6 @@ public:
         const _face *f1, const _face *f2, 
         const int ipr[2], const int nv) {
 		int gsidx[4];
-		int nbeg=verts.size()-4; // first vertex in vec3array
         gsidx[0]=f1->getidx(ipr[1]); // vertex position index
         gsidx[1]=f1->getidx(ipr[0]); // vertex position index
         gsidx[2]=f2->getidx(nv-ipr[0]-1); // vertex position index

src/osgPlugins/flt/MultiTextureRecord.cpp

@@ -29,9 +29,6 @@ MultiTextureRecord::~MultiTextureRecord()
 // virtual
 void MultiTextureRecord::endian()
 {
-
-    int flightVersion = getFlightVersion();
-
     SMultiTexture *pSMultiTexture = (SMultiTexture*)getData();
 
     ENDIAN( pSMultiTexture->layers );

src/osgPlugins/osg/ReaderWriterOSG.cpp

@@ -88,7 +88,7 @@ class OSGReaderWriter : public ReaderWriter
             return WriteResult("Unable to open file for output");
         }
 
-        virtual WriteResult writeNode(const Node& node,const std::string& fileName, const osgDB::ReaderWriter::Options* options)
+        virtual WriteResult writeNode(const Node& node,const std::string& fileName, const osgDB::ReaderWriter::Options*)
         {
             std::string ext = getFileExtension(fileName);
             if (!acceptsExtension(ext)) return WriteResult::FILE_NOT_HANDLED;