oslib-posix: Use sysctl(2) call to resolve exec_dir on NetBSD
NetBSD 8.0(beta) ships with KERN_PROC_PATHNAME in sysctl(2). Older NetBSD versions can use argv[0] parsing fallback. This code section is partly shared with FreeBSD. Signed-off-by: NKamil Rytarowski <n54@gmx.com> Message-id: 20171028194833.23858-1-n54@gmx.com Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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