Log Message:
djview4: Update to 4.12

Changelog:
NEW IN VERSION 4.12
-------------------
- Fixes for recent compilers
- Fixes for Qt-5.15
- Fixes in tiff2pdf.c
- Updated documentation (most browsers no longer support plugins)
- Spanish localization (from Mike Molina)

NEW IN VERSION 4.11
-------------------
- Support for pinch gestures
- New shortcuts on mac
- Support for high dpi displays
- Spanish translations
- Bug fixes
- Workaround for qt5.5 embed bug
- Fixed annotation display bugs revealed by qt5
- Urls in outline are now opened by djview if mime type is djvu.