Removed syntastic and replaced it with ale

Read more here:
https://github.com/w0rp/ale

sources_non_forked/ale/ale_linters/haskell/ghc.vim

@@ -0,0 +1,18 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: ghc for Haskell files
+
+call ale#Set('haskell_ghc_options', '-fno-code -v0')
+
+function! ale_linters#haskell#ghc#GetCommand(buffer) abort
+    return 'ghc '
+    \   . ale#Var(a:buffer, 'haskell_ghc_options')
+    \   . ' %t'
+endfunction
+
+call ale#linter#Define('haskell', {
+\   'name': 'ghc',
+\   'output_stream': 'stderr',
+\   'executable': 'ghc',
+\   'command_callback': 'ale_linters#haskell#ghc#GetCommand',
+\   'callback': 'ale#handlers#haskell#HandleGHCFormat',
+\})