[*] basic in-house cpp linting (#4039)

- add `#pragma once` to remainder files
- "correcter" defines (ANDROID), see https://groups.google.com/g/android-ndk/c/cf9_f1SLXls
- extra miscelly fixups

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4039
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>

src/common/logging.cpp

@@ -320,7 +320,7 @@ struct DebuggerBackend final : public Backend {
     void Flush() noexcept override {}
 };
 #endif
-#ifdef ANDROID
+#ifdef __ANDROID__
 /// @brief Backend that writes to the Android logcat
 struct LogcatBackend : public Backend {
     explicit LogcatBackend() noexcept = default;
@@ -359,7 +359,7 @@ struct Impl {
 #ifdef _WIN32
         lambda(static_cast<Backend&>(debugger_backend));
 #endif
-#ifdef ANDROID
+#ifdef __ANDROID__
         lambda(static_cast<Backend&>(lc_backend));
 #endif
     }
@@ -372,7 +372,7 @@ struct Impl {
 #ifdef _WIN32
     DebuggerBackend debugger_backend{};
 #endif
-#ifdef ANDROID
+#ifdef __ANDROID__
     LogcatBackend lc_backend{};
 #endif
     std::chrono::steady_clock::time_point time_origin{std::chrono::steady_clock::now()};