All symbols starting with `z' in 321/linux

• z 321/linux/qgl_linux.c:279
• zfail 321/linux/qgl_linux.c:315
• zFar 321/linux/qgl_linux.c:121
• zNear 321/linux/qgl_linux.c:121
• zpass 321/linux/qgl_linux.c:315