bug#7544: vc won't commit file with only modified permissions

[Glenn Morris]

Package: emacs

Emacs does not let me commit a file to bzr when the only change I have
made is to the file permissions. 

Example (current trunk and emacs-23 branches) using `Bazaar (bzr) 2.2.2':

mkdir test1
cd test1
touch 1
bzr init
bzr add
bzr commit -m "commit1"
chmod +x 1

emacs -Q 1
C-x v =
   -> === modified file '1' (properties changed: -x to +x)
C-x v v
   -> "Fileset is up-to-date"