title: imagick php 7.2 not setting webp format
body: <p>I have ImageMagick 6.7.8-9 and cwebp and dwebp (libwebp, libwebp-devel) installed and working as expected from the command line.</p>
  
  <p>I have php7.2 installed from webtatic.</p>
  
  <p>the problem I'm facing is that php imagick is not wrking with webp extension (other formats are working fine)
  here's what I get when I try Imagick:
  <strong>Fatal error: Uncaught ImagickException: Unable to set image format in .... : Imagick->setimageformat('webp')</strong></p>
  
  <p>please help me, I googled a lot, stackoverflow has nothing regarding this issue.. any clue, guidance, answer will be apreciated, thanks in advance</p>