libretro: Add compatibility settings loading

src/frontend-common/CMakeLists.txt

@@ -1,4 +1,6 @@
 add_library(frontend-common
+  game_settings.cpp
+  game_settings.h
   opengl_host_display.cpp
   opengl_host_display.h
   vulkan_host_display.cpp
@@ -42,8 +44,6 @@ if(NOT BUILD_LIBRETRO_CORE)
     cubeb_audio_stream.h
     game_list.cpp
     game_list.h
-    game_settings.cpp
-    game_settings.h
     icon.cpp
     icon.h
     imgui_styles.cpp

src/frontend-common/game_settings.cpp

@@ -11,10 +11,12 @@
 #include <utility>
 Log_SetChannel(GameSettings);
 
+#ifndef LIBRETRO
 #ifdef WIN32
 #include "common/windows_headers.h"
 #endif
 #include "SimpleIni.h"
+#endif
 
 namespace GameSettings {
 
@@ -173,6 +175,8 @@ bool Entry::SaveToStream(ByteStream* stream) const
          WriteStringToStream(stream, memory_card_2_shared_path) && WriteStringToStream(stream, input_profile_name);
 }
 
+#ifndef LIBRETRO
+
 static void ParseIniSection(Entry* entry, const char* section, const CSimpleIniA& ini)
 {
   for (u32 trait = 0; trait < static_cast<u32>(Trait::Count); trait++)
@@ -467,6 +471,8 @@ void Database::SetEntry(const std::string& code, const std::string& name, const
     m_entries.emplace(code, entry);
 }
 
+#endif
+
 void Entry::ApplySettings(bool display_osd_messages) const
 {
   constexpr float osd_duration = 10.0f;

src/frontend-common/game_settings.h

@@ -82,6 +82,8 @@ struct Entry
   void ApplySettings(bool display_osd_messages) const;
 };
 
+#ifndef LIBRETRO
+
 class Database
 {
 public:
@@ -97,4 +99,6 @@ private:
   std::unordered_map<std::string, Entry> m_entries;
 };
 
+#endif
+
 }; // namespace GameSettings