libcamera: Move file_descriptor.h to base/

The FileDescriptor class is a generic helper that matches the criteria
for the base library. Move it there.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

include/libcamera/base/meson.build

@@ -11,6 +11,7 @@ libcamera_base_headers = files([
     'event_dispatcher_poll.h',
     'event_notifier.h',
     'file.h',
+    'file_descriptor.h',
     'flags.h',
     'log.h',
     'message.h',

include/libcamera/framebuffer.h

@@ -13,10 +13,9 @@
 #include <vector>
 
 #include <libcamera/base/class.h>
+#include <libcamera/base/file_descriptor.h>
 #include <libcamera/base/span.h>
 
-#include <libcamera/file_descriptor.h>
-
 namespace libcamera {
 
 class Request;

include/libcamera/internal/ipc_pipe.h

@@ -9,10 +9,9 @@
 
 #include <vector>
 
+#include <libcamera/base/file_descriptor.h>
 #include <libcamera/base/signal.h>
 
-#include <libcamera/file_descriptor.h>
-
 #include "libcamera/internal/ipc_unixsocket.h"
 
 namespace libcamera {

include/libcamera/meson.build

@@ -6,7 +6,6 @@ libcamera_public_headers = files([
     'camera.h',
     'camera_manager.h',
     'controls.h',
-    'file_descriptor.h',
     'framebuffer.h',
     'framebuffer_allocator.h',
     'geometry.h',