[*] fix missing '#pragma once' on header files (#4014)

`find src -type f -name '*.h' -not -exec grep -q "#pragma once" {} \; -print`

- ignore qt with header guards already
- smaa too

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4014
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>

src/core/arm/dynarmic/arm_dynarmic.h

@@ -1,9 +1,11 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#pragma once
+
 #include <dynarmic/interface/halt_reason.h>
 
 #include "core/arm/arm_interface.h"

src/core/arm/nce/instructions.h

@@ -1,9 +1,11 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2020 Skyline Team and Contributors
 // SPDX-License-Identifier: MPL-2.0
 
+#pragma once
+
 #include "common/bit_field.h"
 #include "common/common_types.h"