filesystem: use std for DeleteFolder

Remove custom platform implementation of `DeleteFolder` and replace two
uses with `std::filesystem::remove_all` which removes a file or
directory with all its contents.

src/xenia/base/filesystem.h

@@ -41,10 +41,6 @@ std::filesystem::path GetUserFolder();
 // attempting to create it.
 bool CreateParentFolder(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);
-
 // Creates an empty file at the given path.
 bool CreateFile(const std::filesystem::path& path);
 

src/xenia/base/filesystem_posix.cc

@@ -112,12 +112,6 @@ static int removeCallback(const char* fpath, const struct stat* sb,
   return rv;
 }
 
-bool DeleteFolder(const std::filesystem::path& path) {
-  return nftw(path.c_str(), removeCallback, 64, FTW_DEPTH | FTW_PHYS) == 0
-             ? true
-             : false;
-}
-
 static uint64_t convertUnixtimeToWinFiletime(time_t unixtime) {
   // Linux uses number of seconds since 1/1/1970, and Windows uses
   // number of nanoseconds since 1/1/1601

src/xenia/base/filesystem_win.cc

@@ -61,15 +61,6 @@ std::filesystem::path GetUserFolder() {
   return result;
 }
 
-bool DeleteFolder(const std::filesystem::path& path) {
-  auto double_null_path = path.wstring() + std::wstring(L"\0", 1);
-  SHFILEOPSTRUCT op = {0};
-  op.wFunc = FO_DELETE;
-  op.pFrom = double_null_path.c_str();
-  op.fFlags = FOF_NO_UI;
-  return SHFileOperation(&op) == 0;
-}
-
 bool CreateFile(const std::filesystem::path& path) {
   auto handle = CreateFileW(path.c_str(), 0, 0, nullptr, CREATE_ALWAYS,
                             FILE_ATTRIBUTE_NORMAL, nullptr);