[PATCH] Improve performance of strncat

[Wilco Dijkstra]

Hi,

This patch improves strncat performance by using strlen. Strlen has a fast C implementation, so this
will improve performance even on targets which don't have an optimized strlen. It is about twice as
fast as the original strncat in bench-strncat.

ChangeLog:
2014-08-20  Wilco Dijkstra  <wdijkstr@arm.com>

	* string/strncat.c (strncat): Improve performance by using strlen.
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