[*] 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/dynarmic/src/dynarmic/backend/arm64/emit_arm64_memory.h

@@ -6,6 +6,7 @@
  * SPDX-License-Identifier: 0BSD
  */
 
+#pragma once
 #include <cstddef>
 
 namespace oaknut {