the_ocamlspot.vim:fix get syntastic_loclist

older version of syntastic -> syntastic_loclist type is list
new version of syntastic -> syntastic_loclist type is dict

detail:syntastic commit 8f4695c6de157327efc07c25a3f59de0739b9a1c
Merge pull request #2 from kannokanno/fix-syntastic-loclist

the_ocamlspot.vim:fix get syntastic_loclist