This patch rewrites wcsncpy using wcsnlen, wmemset, and wmemcpy. This is
similar to the optimization done on strncpy by f6482cf29d and 6423d4754c.
Checked on x86_64-linux-gnu.
* wcsmbs/wcsncpy.c (__wcsncpy): Rewrite using wcsnlen, wmemset, and
wmemcpy.
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