Add libcamera - dummy (for now)

device/libcamera/buffer.cc

@@ -0,0 +1,35 @@
+#include "libcamera.hh"
+
+extern "C" {
+#include "device/buffer.h"
+#include <stdlib.h>
+};
+
+int libcamera_buffer_open(buffer_t *buf)
+{
+  buf->libcamera = new buffer_libcamera_t{};
+  return 0;
+}
+
+void libcamera_buffer_close(buffer_t *buf)
+{
+  if (buf->libcamera) {
+    delete buf->libcamera;
+    buf->libcamera = NULL;
+  }
+}
+
+int libcamera_buffer_enqueue(buffer_t *buf, const char *who)
+{
+  return -1;
+}
+
+int libcamera_buffer_list_dequeue(buffer_list_t *buf_list, buffer_t **bufp)
+{
+  return -1;
+}
+
+int libcamera_buffer_list_pollfd(buffer_list_t *buf_list, struct pollfd *pollfd, bool can_dequeue)
+{
+  return -1;
+}