bug#21287: 25.0.50; Setting blink-matching-delay has no effect

[Mark Karpov]

Setting of ‘blink-matching-delay’ has no effect, neither for floating
point intervals or integer intervals.

  (setq blink-matching-delay 0.5) ; uses 1 second delay
  (setq blink-matching-delay 3)   ; still uses 1 second delay

I looked at source code and it uses ‘sit-for’, which I tested separately
and it works correctly with floating point intervals and other intervals
as well.

In GNU Emacs 25.0.50.16 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-08-11 on arch
Repository revision: acde89a2088180831e506d0c4255b306a339e291
Windowing system distributor `The X.Org Foundation', version 11.0.11702000
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