[win32] revert operation reset executable flag

[Alexander Belchenko]

On win32 when I do revert on branch that cotains files with executable flag is set, per example on bzr.dev branch, then after revert executable flag is lost.

Reproduce:

$ bzr branch http://bazaar-vcs.org/bzr/bzr.dev
<branching progress messages>
$ bzr st
<empty output>
$ bzr revert
$ bzr st
modified:
  bzr*
  bzrlib/weave.py*
  generate_docs.py*
  setup.py*
  tools/biobench.py*
  tools/trace-revisions*

[Alexander Belchenko (bialix)]

E:\work\MyCode\bzr\devel\bzr.dev>bzr st

E:\work\MyCode\bzr\devel\bzr.dev>bzr revert

E:\work\MyCode\bzr\devel\bzr.dev>bzr st
modified:
  bzr*
  bzrlib/patiencediff.py*
  bzrlib/weave.py*
  generate_docs.py*
  setup.py*
  tools/biobench.py*
  tools/trace-revisions*

E:\work\MyCode\bzr\devel\bzr.dev>bzr revert

E:\work\MyCode\bzr\devel\bzr.dev>bzr st

[John A Meinel (jameinel)]

This has to do with how tree transform handles unchanged files, and the execute bit (especially on win32)