Make the vimtests extra source files instead of data files

Author: Jaro Reinders

yi-keymap-vim/yi-keymap-vim.cabal

@@ -9,7 +9,7 @@ license:        GPL-2
 build-type:     Simple
 cabal-version:  >= 1.10
 
-data-files:
+extra-source-files:
     tests/vimtests/blockvisual/*.test
     tests/vimtests/change/*.test
     tests/vimtests/delete/*.test