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/vfs/devices/host_path_device.cc

@@ -29,7 +29,7 @@ bool HostPathDevice::Initialize() {
   if (!std::filesystem::exists(host_path_)) {
     if (!read_only_) {
       // Create the path.
-      xe::filesystem::CreateFolder(host_path_);
+      std::filesystem::create_directories(host_path_);
     } else {
       XELOGE("Host path does not exist");
       return false;

src/xenia/vfs/devices/host_path_entry.cc

@@ -77,7 +77,7 @@ std::unique_ptr<Entry> HostPathEntry::CreateEntryInternal(
     const std::string_view name, uint32_t attributes) {
   auto full_path = host_path_ / xe::to_path(name);
   if (attributes & kFileAttributeDirectory) {
-    if (!xe::filesystem::CreateFolder(full_path)) {
+    if (!std::filesystem::create_directories(full_path)) {
       return nullptr;
     }
   } else {

src/xenia/vfs/vfs_dump.cc

@@ -62,7 +62,7 @@ int vfs_dump_main(const std::vector<std::string>& args) {
     XELOGI("{}", entry->path());
     auto dest_name = base_path / xe::to_path(entry->path());
     if (entry->attributes() & kFileAttributeDirectory) {
-      xe::filesystem::CreateFolder(dest_name);
+      std::filesystem::create_directories(dest_name);
       continue;
     }