Fix build on MacOS (#1535)

To use std::nullptr_t it is necessary to include <cstddef>
on MacOS Ventura 13.4.1
with clang version 14.0.3 (Xcode 14.3.1)

diff --git a/src/security/LockingPointer.h b/src/security/LockingPointer.h
index 99b4d623f4d20e08d96c33a18c9ddc3172798405..bf2dbfeb69e7b834ea72cebf7f339d5d7d2d9d6b 100644 (file)
--- a/src/security/LockingPointer.h
+++ b/src/security/LockingPointer.h
@@ -12,6 +12,8 @@
 #include "base/Assure.h"
 #include "base/HardFun.h"
 
+#include <cstddef>
+
 #if USE_OPENSSL
 #include "compat/openssl.h"
 #if HAVE_OPENSSL_CRYPTO_H