Patch for "master" branch: https://reviews.mahara.org/10869

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https://bugs.launchpad.net/bugs/1871515

Title:
  pdfunite and ghostscript availability check for RHEL/CentOS

Status in Mahara:
  New

Bug description:
  Adding the following code, we can check pdfunite and ghostscript
  installation on Red Hat Enterprise Linux (RHEL) and CentOS
  environment.

  File to modify:
  export/pdf/lib.php

  Line:
  80

  [Before]
      public static function has_pdf_combiner() {
          // Check we have a valid way to combine pdfs
          $combiner = false;
          if ($pdfunite = exec('apt-cache policy poppler-utils | grep 
Installed')) {
              if (!preg_match('/Installed\: \(none\)/', $pdfunite)) {
                  $combiner = 'pdfunite';
              }
          }
          if ($ghostscript = exec('apt-cache policy ghostscript | grep 
Installed')) {
              if (!preg_match('/Installed\: \(none\)/', $ghostscript)) {
                  $combiner = 'ghostscript';
              }
          }
          return $combiner;
      }

  [After]
      public static function has_pdf_combiner() {
          // Check we have a valid way to combine pdfs
          $combiner = false;
          if ($pdfunite = exec('apt-cache policy poppler-utils | grep 
Installed')) {
              if (!preg_match('/Installed\: \(none\)/', $pdfunite)) {
                  $combiner = 'pdfunite';
              }
          }
          if ($ghostscript = exec('apt-cache policy ghostscript | grep 
Installed')) {
              if (!preg_match('/Installed\: \(none\)/', $ghostscript)) {
                  $combiner = 'ghostscript';
              }
          }
          if ($pgtune = exec('rpm -q poppler-utils')) {
              $combiner = 'pdfunite';
          }
          if ($pgtune = exec('rpm -q ghostscript')) {
              $combiner = 'ghostscript';
          }
          return $combiner;
      }

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