D5725: Workaround for MSVC and catalog loading

[Luigi Toscano]

ltoscano created this revision.
Restricted Application added projects: Frameworks, Documentation.
Restricted Application added subscribers: Documentation, Frameworks.

REVISION SUMMARY
  Apparently setting XML_CATALOG_FILES has no effects on Windows
  at least with MSVC (2017). The variable seems to be set, so
  there may be an issue with the linking, or in libxml2, or
  in some other unidentified place. Forcibly setting the
  catalog seems to work, but let's leave it as a special case
  on MSVC only for now.

TEST PLAN
  Tested on the new CI, tested a package with documentation
  (kconfigwidgets)

REPOSITORY
  R238 KDocTools

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5725

AFFECTED FILES
  src/xslt.cpp

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