libcamera: Standardise on C compatibility headers

Now that our usage of C compatibility header is documented, use them
consistently through the source code.

While at it, group the C and C++ include statements as defined in the
coding style, and fix a handful of #include ordering issues.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/ipa/ipa_interface_test.cpp

@@ -6,13 +6,12 @@
  */
 
 #include <fcntl.h>
+#include <iostream>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
 
-#include <iostream>
-
 #include <libcamera/event_dispatcher.h>
 #include <libcamera/event_notifier.h>
 #include <libcamera/timer.h>

test/media_device/media_device_print_test.cpp

@@ -4,8 +4,8 @@
  *
  * media_device_print_test.cpp - Print out media devices
  */
-#include <iostream>
 
+#include <iostream>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>

test/pipeline/ipu3/ipu3_pipeline_test.cpp

@@ -6,7 +6,6 @@
  */
 
 #include <iostream>
-
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>

test/v4l2_subdevice/test_formats.cpp

@@ -5,8 +5,8 @@
  * libcamera V4L2 Subdevice format handling test
  */
 
-#include <climits>
 #include <iostream>
+#include <limits.h>
 
 #include "v4l2_subdevice.h"
 #include "v4l2_subdevice_test.h"

test/v4l2_videodevice/capture_async.cpp

@@ -5,12 +5,12 @@
  * libcamera V4L2 API tests
  */
 
+#include <iostream>
+
 #include <libcamera/buffer.h>
 #include <libcamera/event_dispatcher.h>
 #include <libcamera/timer.h>
 
-#include <iostream>
-
 #include "thread.h"
 #include "v4l2_videodevice_test.h"
 

test/v4l2_videodevice/controls.cpp

@@ -5,8 +5,8 @@
  * controls.cpp - V4L2 device controls handling test
  */
 
-#include <climits>
 #include <iostream>
+#include <limits.h>
 
 #include "v4l2_videodevice.h"
 

test/v4l2_videodevice/formats.cpp

@@ -5,8 +5,8 @@
  * libcamera V4L2 device format handling test
  */
 
-#include <climits>
 #include <iostream>
+#include <limits.h>
 
 #include "v4l2_videodevice.h"