strace-4.18 test suite: crash with _FORTIFY_SOURCE / invalidly-sized memcpy

[A. Wilcox]

Dear strace developers,

We are creating a Linux distribution focused on reliability, security,
and speed using the musl libc and a special version of fortify-headers
created for that libc.  This fortification has caused an illegal memcpy
in the test suite, in nlattr.c: on 64-bit platforms, 'unsigned int' can
be 64-bits, while nlhdrmsg's msg_len is a __u32 in linux/netlink.h.

The attached patch fixes this by declaring msg_len as uint32_t instead
of unsigned int.

Best,
--arw

-- 
A. Wilcox (awilfox)
Project Lead, Adélie Linux
http://adelielinux.org
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