filesystem: use std for CreateFolder

Remove custom platform implementation of `CreateFolder` and replace uses
with `std::filesystem::create_directories` which creates paths
recursively.

src/xenia/kernel/xam/content_manager.cc

@@ -153,7 +153,7 @@ X_RESULT ContentManager::CreateContent(const std::string_view root_name,
     return X_ERROR_ALREADY_EXISTS;
   }
 
-  if (!xe::filesystem::CreateFolder(package_path)) {
+  if (!std::filesystem::create_directories(package_path)) {
     return X_ERROR_ACCESS_DENIED;
   }
 
@@ -227,7 +227,7 @@ X_RESULT ContentManager::SetContentThumbnail(const XCONTENT_DATA& data,
                                              std::vector<uint8_t> buffer) {
   auto global_lock = global_critical_region_.Acquire();
   auto package_path = ResolvePackagePath(data);
-  xe::filesystem::CreateFolder(package_path);
+  std::filesystem::create_directories(package_path);
   if (std::filesystem::exists(package_path)) {
     auto thumb_path = package_path / kThumbnailFileName;
     auto file = xe::filesystem::OpenFile(thumb_path, "wb");

src/xenia/kernel/xam/user_profile.cc

@@ -158,7 +158,7 @@ void UserProfile::SaveSetting(UserProfile::Setting* setting) {
     auto serialized_setting = setting->Serialize();
     auto content_dir =
         kernel_state()->content_manager()->ResolveGameUserContentPath();
-    xe::filesystem::CreateFolder(content_dir);
+    std::filesystem::create_directories(content_dir);
     auto setting_id = fmt::format("{:08X}", setting->setting_id);
     auto file_path = content_dir / setting_id;
     auto file = xe::filesystem::OpenFile(file_path, "wb");