Defines starting with `c' in bsd/kern

• CC bsd/kern/tty.c:166
• CCLASSMASK bsd/kern/tty.c:162
• CDEV_MAJOR bsd/kern/tty_tty.c:81
• CDEV_MAJOR_C bsd/kern/tty_pty.c:114
• CDEV_MAJOR_S bsd/kern/tty_pty.c:113
• CR bsd/kern/tty.c:167