Before:
  runtime ale_linters/make/checkmake.vim

After:
  call ale#linter#Reset()

Execute(Parsing checkmake errors should work):
  AssertEqual
  \ [
  \   {
  \      'bufnr': 42,
  \      'lnum': 1,
  \      'type': 'E',
  \      'code': 'woops',
  \      'text': 'an error has occurred',
  \   }
  \ ],
  \ ale_linters#make#checkmake#Handle(42, [
  \   "This shouldn't match",
  \   '1:woops:an error has occurred',
  \ ])