- extract MaterialHelper and move all of its members to aiMaterial in /include.

- pull in IOhannes' patch to set the gcc default visibility for all symbols to NO and to mark ASSIMP_API with __attribute__ ((visibility("default"))).
- drop unneeded ASSIMP_API from most internal classes in /code, we just need to keep some exports on Windows to keep AssimpView alive.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1066 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/TextureTransform.h

@@ -72,7 +72,7 @@ struct TTUpdateInfo
 	unsigned int* directShortcut;
 
 	//! Material 
-	MaterialHelper *mat;
+	aiMaterial *mat;
 
 	//! Texture type and index
 	unsigned int semantic, index;
@@ -188,7 +188,7 @@ struct STransformVecInfo : public aiUVTransform
 /** Helper step to compute final UV coordinate sets if there are scalings
  *  or rotations in the original data read from the file.
 */
-class ASSIMP_API TextureTransformStep : public BaseProcess
+class TextureTransformStep : public BaseProcess
 {
 public: