[vim] check if vim has viminfofile before setting

The viminfofile is not always compiled into the available vim, leading
to an error when trying to set it.

vim/vimrc

@@ -56,7 +56,9 @@ set nocompatible
                 "   | |    |      |     |     |
                 "   v v    v      v     v     v
     set     viminfo=h,'500,<10000,s1000,/1000,:1000
+    if has('viminfofile')
       set   viminfofile=~/.vim/viminfo
+    endif
     set     virtualedit=block
     set     wildignore=*.o,*.obj,*.pyc,*.exe,*.so,*.dll
     set     wildmenu