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Cope with glibc too old to have epoll_create1().

Commitfa31b6f supposed that we didn't have to worry about thatanymore, but it seems that RHEL5 is like that, and that's stilla 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/12307.1493325329@sss.pgh.pa.us

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src/backend/storage/ipc
- latch.c

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`‎src/backend/storage/ipc/latch.c`

Lines changed: 9 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -574,9 +574,18 @@ CreateWaitEventSet(MemoryContext context, int nevents)`
`574`	`574`	`set->nevents_space=nevents;`
`575`	`575`
`576`	`576`	`#if defined(WAIT_USE_EPOLL)`
	`577`	`+#ifdefEPOLL_CLOEXEC`
`577`	`578`	`set->epoll_fd=epoll_create1(EPOLL_CLOEXEC);`
`578`	`579`	`if (set->epoll_fd<0)`
`579`	`580`	`elog(ERROR,"epoll_create1 failed: %m");`
	`581`	`+#else`
	`582`	`+/* cope with ancient glibc lacking epoll_create1 (e.g., RHEL5) */`
	`583`	`+set->epoll_fd=epoll_create(nevents);`
	`584`	`+if (set->epoll_fd<0)`
	`585`	`+elog(ERROR,"epoll_create failed: %m");`
	`586`	`+if (fcntl(set->epoll_fd,F_SETFD,FD_CLOEXEC)==-1)`
	`587`	`+elog(ERROR,"fcntl(F_SETFD) failed on epoll descriptor: %m");`
	`588`	`+#endif/* EPOLL_CLOEXEC */`
`580`	`589`	`#elif defined(WAIT_USE_WIN32)`
`581`	`590`
`582`	`591`	`/*`

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Commit53b1578

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`‎src/backend/storage/ipc/latch.c`

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