libobs: Fix ImageMagick header path

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Since ImageMagick 7, the header path has been changed.  This commit
implements a check for the version being used, and includes the
header as is appropriate.

Special thanks to Hu.

Mantis-Bug: https://obsproject.com/mantis/view.php?id=966

Gentoo-Bug: https://bugs.gentoo.org/627520

Closes jp9000/obs-studio#1018

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