bug#33587: [PROPOSED] Default to disabling ImageMagick

[Alan Third]

On Sun, Dec 02, 2018 at 03:51:57PM -0800, Paul Eggert wrote:
> Andreas Schwab wrote:
> > ImageMagick is the only backend that supports scaling.
> 
> Good point, and if we make the change, the scaling issue should be mentioned
> in INSTALL. Perhaps something like the following wording:
> 
> "Although ImageMagick support is disabled by default due to security
> and stability concerns, you can enable it by configuring with
> --with-imagemagick.  ImageMagick is the only backend that supports
> image scaling."

FWIW the NS port on master supports scaling through the NS toolkit,
although there is the problem that most lisp code that wants to scale
checks exclusively for imagemagick support.
-- 
Alan Third