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/base/filesystem.cc

@@ -18,7 +18,7 @@ bool CreateParentFolder(const std::filesystem::path& path) {
   if (path.has_parent_path()) {
     auto parent_path = path.parent_path();
     if (!std::filesystem::exists(parent_path)) {
-      return CreateFolder(parent_path);
+      return std::filesystem::create_directories(parent_path);
     }
   }
   return true;

src/xenia/base/filesystem.h

@@ -41,10 +41,6 @@ std::filesystem::path GetUserFolder();
 // attempting to create it.
 bool CreateParentFolder(const std::filesystem::path& path);
 
-// Creates a folder at the specified path.
-// Returns true if the path was created.
-bool CreateFolder(const std::filesystem::path& path);
-
 // Recursively deletes the files and folders at the specified path.
 // Returns true if the path was found and removed.
 bool DeleteFolder(const std::filesystem::path& path);

src/xenia/base/filesystem_posix.cc

@@ -106,10 +106,6 @@ bool TruncateStdioFile(FILE* file, uint64_t length) {
   return true;
 }
 
-bool CreateFolder(const std::filesystem::path& path) {
-  return mkdir(path.c_str(), 0774);
-}
-
 static int removeCallback(const char* fpath, const struct stat* sb,
                           int typeflag, struct FTW* ftwbuf) {
   int rv = remove(fpath);

src/xenia/base/filesystem_win.cc

@@ -61,15 +61,6 @@ std::filesystem::path GetUserFolder() {
   return result;
 }
 
-bool CreateFolder(const std::filesystem::path& path) {
-  std::filesystem::path create_path;
-  for (auto it = path.begin(); it != path.end(); ++it) {
-    create_path /= *it;
-    CreateDirectoryW(create_path.c_str(), nullptr);
-  }
-  return std::filesystem::exists(path);
-}
-
 bool DeleteFolder(const std::filesystem::path& path) {
   auto double_null_path = path.wstring() + std::wstring(L"\0", 1);
   SHFILEOPSTRUCT op = {0};