Cope with glibc too old to have epoll_create1().

Commit fa31b6f4e supposed that we didn't have to worry about that
anymore, but it seems that RHEL5 is like that, and that's still
a supported platform.  Put back the prior coding under an #ifdef,
adding an explicit fcntl() to retain the desired CLOEXEC property.

Discussion: https://postgr.es/m/12307.1493325...@sss.pgh.pa.us

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/53b157846024f28f8d48a6e0163c89a577f886a8

Modified Files
--------------
src/backend/storage/ipc/latch.c | 9 +++++++++
1 file changed, 9 insertions(+)


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