libcamera: base: Add missing private.h includes

Certain private header files failed to include `private.h`, fix that.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/base/memfd.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <libcamera/base/private.h>
+
 #include <libcamera/base/flags.h>
 #include <libcamera/base/unique_fd.h>
 

include/libcamera/base/regex.h

@@ -5,6 +5,8 @@
  * std::regex wrapper for gcc
  */
 
+#include <libcamera/base/private.h>
+
 #pragma GCC diagnostic push
 #if defined __SANITIZE_ADDRESS__ && defined __OPTIMIZE__
 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"