Defines starting with `c' in bsd/kern

• CC bsd/kern/tty.c:168
• CCLASSMASK bsd/kern/tty.c:164
• CDEV_MAJOR bsd/kern/tty_tty.c:84
• CDEV_MAJOR_C bsd/kern/tty_pty.c:120
• CDEV_MAJOR_S bsd/kern/tty_pty.c:119
• COMPAT_OLDSOCK bsd/kern/uipc_syscalls.c:104
• CR bsd/kern/tty.c:169