[AArch64] Set errno in ftruncate() and truncate().

[Marcus Shawcroft]

Ensure errno is set by ftruncate() and truncate() stubs.  This is the 
AArch64 equivalent of this patch:

https://sourceware.org/ml/newlib/2013/msg00933.html

Committed.

/Marcus

2013-11-21  Marcus Shawcroft  <marcus.shawcroft@arm.com>

	* aarch64/ftruncate.c: Include errno.h.
	(ftruncate) Set errno.
	* aarch64/truncate.c: Include errno.h.
	(truncate) Set errno.
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