Revert "evince as pdf previewer"

This reverts commit ecdbc9cc.

This is not longer necessary since okular is working fine on new fedora
installation.

.latexmkrc

@@ -2,8 +2,3 @@
 $pdf_mode= 4 ;
 @default_files = ('.maindir/tex/main.tex');
 $out_dir = '.maindir/out';
-# my okular stops currently with a segmentation fault
-# so I use another viewer: evince
-# start is necessary to start evince detached, otherwise latexmk -pvc is blocked by evince running
-# I am not sure if this would work with file names with blanks. Bad idea anyway!
-$pdf_previewer = "start evince %O %S"