Merge pull request #1563 from IngoHeimbach/fix/gcc-fatal-error

Fatal GCC errors are handled as errors not warnings

autoload/ale/handlers/gcc.vim

@@ -48,7 +48,7 @@ function! ale#handlers#gcc#HandleGCCFormat(buffer, lines) abort
 
         let l:item = {
         \   'lnum': str2nr(l:match[2]),
-        \   'type': l:match[4] is# 'error' ? 'E' : 'W',
+        \   'type': (l:match[4] is# 'error' || l:match[4] is# 'fatal error') ? 'E' : 'W',
         \   'text': s:RemoveUnicodeQuotes(l:match[5]),
         \}