ddac0e5 ImageMagick is not part of RHEL 8+, add back conditionals

Authored and Committed by tpopela a year ago
    ImageMagick is not part of RHEL 8+, add back conditionals
    
    The ImageMagick and RHEL related conditionals were dropped in commit
    d0508a7, but they have to stay, because only RHEL 7 had ImageMagick and
    not any newer versions of RHEL. Currently it's only autotrace that is
    pulling ImageMagick into ELN/RHEL 10.
    
    Also update the github-#70 test so it's expected to fail when compiled
    without ImageMagick support (due to lack of XPM support).
    
        
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