Adding fcntl interface.

* configure: changing HAVE_FCNTL_H to HAVE_FCNTL.

* sysif.c (flock_s, type_s, whence_s, start_s, len_s, pid_s):
New symbol variables.
(flock_pack, flock_unpack, fcntl_wrap): New static functions.
(sysif_init): Initialize new symbol variables.
Create flock struct type.  Register new intrinsic variables:
o-accmode, o-rdonly, o-wronly, o-rdwr, o-creat, o-noctty,
o-trunc, o-append, o-nonblock, o-sync, o-async, o-directory,
o-nofollow, o-cloexec, o-direct, o-noatime, o-path, f-dupfd,
f-dupfd-cloexec, f-getfd, f-setfd, fd-cloexec, f-getfl,
f-setfl, f-getlk, f-setlk, f-setlkw, f-rdlck, f-wrlck,
f-unlck, seek-set, seek-cur and seek-end.
Register fcntl intrinsic function.

* txr.1: Documented.

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