[Differential] [Updated] D4558: Fail the build early if xmllint is not available

[Luigi Toscano]

ltoscano added a reviewer: winterz.

REPOSITORY
  R238 KDocTools

REVISION DETAIL
  https://phabricator.kde.org/D4558

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: ltoscano, winterz
Cc: #frameworks, #documentation
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