Bug#792264: opencv: FTBFS on x32 (and other new Linux architectures) due to use of sysctl

[Thorsten Glaser]

Source: opencv
Version: 2.4.9.1+dfsg-1.1
Severity: important
Tags: patch

Hi,

the attached patch lets CMake search for <sys/sysctl.h> and
uses it only if found.

This, together with the fix for #792262, fixes opencv on x32.

-- System Information:
Debian Release: stretch/sid
  APT prefers unreleased
  APT policy: (500, 'unreleased'), (500, 'buildd-unstable'), (500, 'unstable')
Architecture: x32 (x86_64)
Foreign Architectures: i386, amd64

Kernel: Linux 4.0.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/lksh
Init: sysvinit (via /sbin/init)
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