Defines starting with `h' in 321/linux

• hu_clip_maxs 321/linux/qasm.h:308
• hu_clip_mins 321/linux/qasm.h:307
• hu_clipnodes 321/linux/qasm.h:303
• hu_firstclipnode 321/linux/qasm.h:305
• hu_lastclipnode 321/linux/qasm.h:306
• hu_planes 321/linux/qasm.h:304
• hu_size 321/linux/qasm.h:309