use FilenameUnifier to make canonical

pandatool/src/egg-palettize/filenameUnifier.cxx

@@ -128,7 +128,7 @@ make_user_filename(Filename filename) {
 
 ////////////////////////////////////////////////////////////////////
 //     Function: FilenameUnifier::make_canonical
-//       Access: Private, Static
+//       Access: Public, Static
 //  Description: Does the same thing as Filename::make_canonical()--it
 //               converts the filename to its canonical form--but
 //               caches the operation so that repeated calls to

pandatool/src/egg-palettize/filenameUnifier.h

@@ -44,9 +44,9 @@ public:
   static Filename get_bam_filename(Filename filename);
   static Filename make_egg_filename(Filename filename);
   static Filename make_user_filename(Filename filename);
+  static void make_canonical(Filename &filename);
 
 private:
-  static void make_canonical(Filename &filename);
 
   static Filename _txa_filename;
   static Filename _txa_dir;

pandatool/src/egg-palettize/textureImage.cxx

@@ -689,7 +689,7 @@ copy_unplaced(bool redo_all) {
         placement->get_omit_reason() != OR_unknown) {
       DestTextureImage *dest = new DestTextureImage(placement);
       Filename filename = dest->get_filename();
-      filename.make_canonical();
+      FilenameUnifier::make_canonical(filename);
 
       pair<Dests::iterator, bool> insert_result = generate.insert
         (Dests::value_type(filename, dest));