Set GCC flags appropriately for older versions

autoload/ale/handlers/gcc.vim

@@ -26,6 +26,18 @@ function! s:RemoveUnicodeQuotes(text) abort
     return l:text
 endfunction
 
+function! ale#handlers#gcc#ParseGCCVersion(lines) abort
+    for l:line in a:lines
+        let l:match = matchstr(l:line, '\d\.\d\.\d')
+
+        if !empty(l:match)
+            return ale#semver#Parse(l:match)
+        endif
+    endfor
+
+    return []
+endfunction
+
 function! ale#handlers#gcc#HandleGCCFormat(buffer, lines) abort
     let l:include_pattern = '\v^(In file included | *)from ([^:]*):(\d+)'
     let l:include_lnum = 0