[ruby-core:87591] [Ruby trunk Bug#14864] some old linux has no O_CLOEXEC

Issue #14864 has been reported by wangpeiwen (沛文 王).

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Bug #14864: some old linux has no O_CLOEXEC
https://bugs.ruby-lang.org/issues/14864

* Author: wangpeiwen (沛文 王)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.1
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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I get some error when building ruby on suse 10, 
~~~
compiling dir.c
dir.c: In function ‘nogvl_opendir_at’:
dir.c:1439: error: ‘O_CLOEXEC’ undeclared (first use in this function)
dir.c:1439: error: (Each undeclared identifier is reported only once
dir.c:1439: error: for each function it appears in.)
make: *** [Makefile:398: dir.o] Error 1
~~~
and I see some "ifdef O_CLOEXEC" in io.c and etc.
~~~
ext/dbm/dbm.c:169:29:     * gdbm 1.10 works with O_CLOEXEC.  gdbm 1.9.1 silently ignore it.
ext/dbm/dbm.c:171:9:#ifndef O_CLOEXEC
ext/dbm/dbm.c:172:12:#   define O_CLOEXEC 0
ext/dbm/dbm.c:177:49:        dbm = dbm_open(RSTRING_PTR(file), flags|O_CLOEXEC, mode);
ext/dbm/dbm.c:182:62:            dbm = dbm_open(RSTRING_PTR(file), O_RDWR|O_CREAT|O_CLOEXEC, mode);
ext/dbm/dbm.c:185:54:            dbm = dbm_open(RSTRING_PTR(file), O_RDWR|O_CLOEXEC, 0);
ext/dbm/dbm.c:188:56:            dbm = dbm_open(RSTRING_PTR(file), O_RDONLY|O_CLOEXEC, 0);
ext/sdbm/_sdbm.c:228:8:#ifdef O_CLOEXEC
ext/sdbm/_sdbm.c:229:18:        flags |= O_CLOEXEC;
ext/pty/pty.c:257:38:    /* FreeBSD 9.2 or later supports O_CLOEXEC
ext/pty/pty.c:266:14:# if defined(O_CLOEXEC)
ext/pty/pty.c:268:51:    * So version dependency on GNU/Linux is same as O_CLOEXEC with open().
ext/pty/pty.c:269:5:     * O_CLOEXEC is available since Linux 2.6.23.  Linux 2.6.18 silently ignore it. */
ext/pty/pty.c:270:11:   flags |= O_CLOEXEC;
dir.c:1439:41:    const int opendir_flags = (O_RDONLY|O_CLOEXEC|
io.c:238:13:#if defined(O_CLOEXEC) && defined(F_GETFD)
io.c:246:27:#endif /* fall through if O_CLOEXEC does not work: */
io.c:257:8:#ifdef O_CLOEXEC
io.c:258:8:    /* O_CLOEXEC is available since Linux 2.6.23.  Linux 2.6.18 silently ignore it. */
io.c:259:14:    flags |= O_CLOEXEC;
io.c:295:35:#if defined(HAVE_DUP3) && defined(O_CLOEXEC)
io.c:298:38:            ret = dup3(oldfd, newfd, O_CLOEXEC);
io.c:327:29:        ret = pipe2(fildes, O_CLOEXEC);
~~~
should we add ifdef in dir.c for building on some platform without O_CLOEXEC



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