Fix Linux builds

src/common/ntapi.cpp

@@ -1,6 +1,8 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#ifdef _WIN32
+
 #include "ntapi.h"
 
 NtDelayExecution_t NtDelayExecution = nullptr;
@@ -18,3 +20,5 @@ void Initialize() {
 }
 
 } // namespace Common::NtApi
+
+#endif