[Cmake] INSTALL_FILES installs unconditionally

[Iker Arizmendi]

Our network has cmake 1.8.3 and I've noticed that
when I use the INSTALL_FILES directive the destination
files are updated even if they haven't changed (which forces
some of our other packages to rebuild). Does the most
recent version of CMake check to see if the install of
a file is necessary?

Regards,
Iker


-- 
Iker Arizmendi
AT&T Labs - Research
Speech and Image Processing Lab
e: iker at research.att.com
w: http://research.att.com