[cmake-developers] FindImageMagick.cmake backwards compatibility

[Rolf Eike Beer]

While hacking on various Find*.cmake modules I also made some changes to the 
ImageMagick module, and one of them is not really backwards compatible. I 
would consider it a bugfix, but you may judge yourself.

ImageMagick_FOUND was set to true if all requested components were found. Not 
surprising on the first look. But that also means: if you requested no 
components and no components were found that means none is missing: 
ImageMagick_FOUND was TRUE. It is not anymore as you may have guessed.

So when ImageMagick is installed everything behaves as always. But if no 
ImageMagick is installed behaviour was this:

find_package(ImageMagick) -> ImageMagick_FOUND = TRUE
find_package(ImageMagick mogrigy) -> FALSE

and now it is:

find_package(ImageMagick) -> ImageMagick_FOUND = FALSE
find_package(ImageMagick mogrigy) -> FALSE

Any objections?

Eike
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