[committed arm/ilp32] aarch64: Fix bits/utmp.h for GCC 8

[Szabolcs Nagy]

fixed a warning issue in the arm/ilp32 build, the branch is still based
on the 2.27 release.
---

The same suppression of -Wstringop-truncation warnings as in commit
7532837d7b03b3ca5b9a63d77a5bd81dd23f3d9c but for aarch64.

2018-02-22  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/unix/sysv/linux/aarch64/bits/utmp.h (struct utmp): Use
	__attribute_nonstring__.
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