win32 compilation issue

panda/src/movies/ffmpegVideoCursor.h

@@ -66,7 +66,7 @@ public:
 
 public:
   // Nested class must be public for PT(FfmpegBuffer) to work correctly.
-  class FfmpegBuffer : public Buffer {
+  class EXPCL_PANDA_MOVIES FfmpegBuffer : public Buffer {
   public:
     ALLOC_DELETED_CHAIN(FfmpegBuffer);
     INLINE FfmpegBuffer(size_t block_size, double video_timebase);

panda/src/movies/movieVideoCursor.h

@@ -63,7 +63,7 @@ PUBLISHED:
 
   virtual bool set_time(double timestamp, int loop_count);
 
-  class Buffer : public TypedReferenceCount {
+  class EXPCL_PANDA_MOVIES Buffer : public TypedReferenceCount {
   public:
     ALLOC_DELETED_CHAIN(Buffer);
     Buffer(size_t block_size);