read-cache: close index.lock in do_write_index

read-cache: close index.lock in do_write_index

Teach do_write_index() to close the index.lock file
before getting the mtime and updating the istate.timestamp
fields.

On Windows, a file's mtime is not updated until the file is
closed.  On Linux, the mtime is set after the last flush.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>