[TYPO3-dam] DAM indexing requires imagemagick > 4.2.9

[Steffen Gebert]

> 4.2.9 is IMHO wastly outdate, however I guess a patch that works with 
> recent AND old version (in case possible) would be the best option. I 
> guess one might also check the IM version and have a switch for the 
> different params.

Further opinions?

I tought 4.2.9 is inoffical recommended for TYPO3 because of lots auf API
changes in newer versions...

Regards
Steffen