I actually gave ply_video_buffer_destroy the name
ply_video_buffer_free when I implemented it, so rename it in the
header file.
#ifndef PLY_HIDE_FUNCTION_DECLARATIONS
PlyVideoBuffer *ply_video_buffer_new (const char *device_name);
-void ply_video_buffer_destroy (PlyVideoBuffer *buffer);
+void ply_video_buffer_free (PlyVideoBuffer *buffer);
bool ply_video_buffer_open (PlyVideoBuffer *buffer);
bool ply_video_buffer_device_is_open (PlyVideoBuffer *buffer);
char *ply_video_buffer_get_device_name (PlyVideoBuffer *buffer);