Configure: fixed --test-build-epoll on FreeBSD 13.

In FreeBSD 13, eventfd(2) was added, and this breaks build
with --test-build-epoll and without --with-file-aio.  Fix is
to move eventfd(2) detection to auto/os/linux, as it is used
only on Linux as a notification mechanism for epoll().
2 files changed
tree: f688710afbb22a95ea0c765587aa4fa4d8ad36e4
  1. auto/
  2. conf/
  3. contrib/
  4. docs/
  5. misc/
  6. src/
  7. .hgtags