When detecting which exe to use, check for these first.
CCBUG: 156639
This should be backported to 4.0, but I don't have a checkout of that.
svn path=/trunk/KDE/kdegraphics/okular/; revision=816881
* Add FilePrinter class to enable printing via postscript files
* DJVU, PDF, and PS backends print FilePrinter
* All backends enable printing of bookmarked pages
* Print and Print Preview actions enabled/disabled depending on backends
printing ability
Note that FilePrinter only works on *NIX platforms with Cups, lpr, or lp.
svn path=/trunk/KDE/kdegraphics/okular/; revision=741990