Typedefs starting with `t' in BSD4-4

• tcflag_t sys/termios.h:177
• tcp_seq netinet/tcp.h:36
• thread_t vm/kern_lock.c:76
• time_t nfs/nfs_nqlease.c:85
• tpcb_struct netiso/tp.trans:131
• tp_PCB_ netiso/tp_driver.c:64
• tpr_t sys/tprintf.h:36