Get rid of sysctl includes on Linux.

kilobyte · Luke Petre · commit 61936eb1a43e · 2017-03-10T16:40:29.000Z
The 'sysctl' syscall has been strongly deprecated on Linux for ages.
Currently, on old architectures it will spam syslog whenever used, and on
newer ones it's missing from the headers altogether.  Opencv has migrated
away on Linux already, but #includes were left lingering.  This commit
removes them on non-__APPLE__, unbreaking x32 (and probably others).
diff --git a/modules/core/src/parallel.cpp b/modules/core/src/parallel.cpp
@@ -56,7 +56,7 @@
     #include <sys/types.h>
     #if defined ANDROID
         #include <sys/sysconf.h>
-    #else
+    #elif defined __APPLE__
         #include <sys/sysctl.h>
     #endif
 #endif
diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
@@ -163,8 +163,6 @@ std::wstring GetTempFileNameWinRT(std::wstring prefix)
 #include <sys/types.h>
 #if defined ANDROID
 #include <sys/sysconf.h>
-#else
-#include <sys/sysctl.h>
 #endif
 #endif
 
diff --git a/modules/highgui/src/cap_ffmpeg_impl.hpp b/modules/highgui/src/cap_ffmpeg_impl.hpp
@@ -129,9 +129,9 @@ extern "C" {
     #include <unistd.h>
     #include <stdio.h>
     #include <sys/types.h>
-    #include <sys/sysctl.h>
     #include <sys/time.h>
 #if defined __APPLE__
+    #include <sys/sysctl.h>
     #include <mach/clock.h>
     #include <mach/mach.h>
 #endif
