Use removePathForcibly

https://hackage.haskell.org/package/directory-1.3.4.0/docs/System-Directory.html#v:removePathForcibly

The problem: it's since `directory-1.2.7.0`. But it's probably right things compared to `removeDirectoryRecursive`. `removePathForcibly` works on windows

See https://github.com/haskell/directory/issues/59#issuecomment-237458410

Also `cabal-install:test:integration-tests2` has a test case disabled, with this issue linked. Enable it when fixing.

Start by locating the code that uses removeDirectoryRecursive and the disabled case in cabal-install:test:integration-tests2. Read the linked directory documentation and issue discussion to confirm the Windows behavior. Done means using removePathForcibly where appropriate and re-enabling the linked integration test with the suite passing.

Written by the indexing model from the issue text.