From Wang Rui, added exports for windows build

include/osgDB/DotOsgWrapper

@@ -80,7 +80,7 @@ class OSGDB_EXPORT DotOsgWrapper : public osg::Referenced
 };
 
 /**  Proxy class for automatic registration of DotOsgWrappers with the Registry.*/
-class RegisterDotOsgWrapperProxy
+class OSGDB_EXPORT RegisterDotOsgWrapperProxy
 {
     public:
 
@@ -98,7 +98,7 @@ class RegisterDotOsgWrapperProxy
 };
 
 template<class T>
-class TemplateRegisterDotOsgWrapperProxy : public RegisterDotOsgWrapperProxy, public T
+class OSGDB_EXPORT TemplateRegisterDotOsgWrapperProxy : public RegisterDotOsgWrapperProxy, public T
 {
     public:
 

include/osgDB/InputStream

@@ -39,13 +39,13 @@ public:
     
     const std::string& getField() const { return _field; }
     const std::string& getError() const { return _error; }
-	
+    
 protected:
     std::string _field;
     std::string _error;
 };
 
-class InputStream
+class OSGDB_EXPORT InputStream
 {
 public:
     typedef std::map< unsigned int, osg::ref_ptr<osg::Array> > ArrayMap;

include/osgDB/ObjectWrapper

@@ -21,9 +21,9 @@ namespace osgDB
 {
 
 typedef std::vector<std::string> StringList;
-extern void split( const std::string& src, StringList& list, char separator=' ' );
+extern OSGDB_EXPORT void split( const std::string& src, StringList& list, char separator=' ' );
 
-class BaseCompressor : public osg::Referenced
+class OSGDB_EXPORT BaseCompressor : public osg::Referenced
 {
 public:
     BaseCompressor() {}
@@ -37,7 +37,7 @@ protected:
     std::string _name;
 };
 
-class ObjectWrapper : public osg::Referenced
+class OSGDB_EXPORT ObjectWrapper : public osg::Referenced
 {
 public:
     typedef std::vector< osg::ref_ptr<BaseSerializer> > SerializerList;

include/osgDB/OutputStream

@@ -38,13 +38,13 @@ public:
     
     const std::string& getField() const { return _field; }
     const std::string& getError() const { return _error; }
-	
+    
 protected:
     std::string _field;
     std::string _error;
 };
 
-class OutputStream
+class OSGDB_EXPORT OutputStream
 {
 public:
     typedef std::map<const osg::Array*, unsigned int> ArrayMap;