The timerfd functions slow down emacs

[Ken Brown <kbrown at cornell dot edu>]

When emacs is built, it detects the timerfd functions and uses them if they're 
found.  Now that Cygwin has these functions, the resulting build of emacs is 
very slow to respond to user input.  If I press a key, there is a 1-2 second 
delay before emacs responds.

I can work around this by configuring emacs with emacs_cv_have_timerfd=no, but 
it would be nice to find the cause.  I'll try to make an STC, but I thought I'd 
report it here in the meantime, in case anyone has ideas or debugging suggestions.

Ken

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