D7809: Fix building synctex 1.19 on Windows

[Albert Astals Cid]

aacid accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R223 Okular

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7809

To: rkflx, #okular, aacid
Cc: aacid