Removed syntastic and replaced it with ale

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

sources_non_forked/ale/ale_linters/make/checkmake.vim

@@ -0,0 +1,24 @@
+" Author: aurieh - https://github.com/aurieh
+
+function! ale_linters#make#checkmake#Handle(buffer, lines) abort
+    let l:pattern = '\v^(\d+):(.+):(.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        call add(l:output, {
+        \    'bufnr': a:buffer,
+        \    'lnum': l:match[1] + 0,
+        \    'type': 'E',
+        \    'code': l:match[2],
+        \    'text': l:match[3],
+        \})
+    endfor
+    return l:output
+endfunction
+
+call ale#linter#Define('make', {
+\   'name': 'checkmake',
+\   'executable': 'checkmake',
+\   'command': 'checkmake %s --format="{{.LineNumber}}:{{.Rule}}:{{.Violation}}"',
+\   'callback': 'ale_linters#make#checkmake#Handle',
+\})