[Windows] Fix FileManager.removeItem

- Get the fsr of the passed in path before using it
- Add the correct path to the directory stack

Author: gmittert

Foundation/FileManager+Win32.swift

@@ -405,30 +405,37 @@ extension FileManager {
         guard alreadyConfirmed || shouldRemoveItemAtPath(path, isURL: isURL) else {
             return
         }
-        let faAttributes = try windowsFileAttributes(atPath: path)
+        let url = URL(fileURLWithPath: path)
+        var fsrBuf: UnsafeMutableBufferPointer<WCHAR> = UnsafeMutableBufferPointer.allocate(capacity: path.length * 2)
+        defer { fsrBuf.deallocate() }
+        _CFURLGetWideFileSystemRepresentation(url._cfObject, false, fsrBuf.baseAddress, path.length * 2)
+        let length = url.firstIndex(where: {$0 == 0}) ?? (path.length * 2)
+        let fsrPath = String(utf16CodeUnits: fsrBuf.baseAddress!, count: length)
+
+        let faAttributes = try windowsFileAttributes(atPath: fsrPath)
         if faAttributes.dwFileAttributes & DWORD(FILE_ATTRIBUTE_DIRECTORY) == 0 {
-            if !path.withCString(encodedAs: UTF16.self, DeleteFileW) {
+            if !fsrPath.withCString(encodedAs: UTF16.self, DeleteFileW) {
                 throw _NSErrorWithWindowsError(GetLastError(), reading: false)
             }
             return
         }
-        var dirStack = [path]
+        var dirStack = [fsrPath]
         var itemPath = ""
         while let currentDir = dirStack.popLast() {
             do {
                 itemPath = currentDir
                 guard alreadyConfirmed || shouldRemoveItemAtPath(itemPath, isURL: isURL) else {
                     continue
                 }
-                guard !path.withCString(encodedAs: UTF16.self, RemoveDirectoryW) else {
+                guard !itemPath.withCString(encodedAs: UTF16.self, RemoveDirectoryW) else {
                     continue
                 }
                 guard GetLastError() == ERROR_DIR_NOT_EMPTY else {
                     throw _NSErrorWithWindowsError(GetLastError(), reading: false)
                 }
-                dirStack.append(path)
+                dirStack.append(itemPath)
                 var ffd: WIN32_FIND_DATAW = WIN32_FIND_DATAW()
-                let h: HANDLE = (path + "\\*").withCString(encodedAs: UTF16.self, {
+                let h: HANDLE = (itemPath + "\\*").withCString(encodedAs: UTF16.self, {
                     FindFirstFileW($0, &ffd)
                 })
                 guard h != INVALID_HANDLE_VALUE else {