fs: stop fixing EPERM on Windows

Originally, when rimraf faced an EPERM on Windows, it would try to change the file permissions of the entry and attempt to remove it again. However, rm -rf doesn't change any file permissions, so rimraf shouldn't either.

This change also updates test/common/tmpdir.js to repeatedly try changing the file permissions of its contents to 0o777 when an EACCES or an EPERM is faced while attempting to remove them.

Signed-off-by: Darshan Sen raisinten@gmail.com