Remove 'Warning_Mode' global because it is never wrote

Author: HugoGGuerrier

lkql_checker/src/gnatcheck-options.ads

@@ -94,16 +94,6 @@ package Gnatcheck.Options is
    KP_Version : GNAT.OS_Lib.String_Access;
    --  If set, the relevant GNAT version to check when running gnatkp.
 
-   type Warning_Modes is
-     (Quiet,  --  all warnings are suppressed
-      Short,
-      Normal,
-      Full);
-
-   Warning_Mode : Warning_Modes := Normal;
-   --  Specifies the warning message level
-   --  '-w(q|s|n|f)
-
    Log_Mode : Boolean := False;
    --  Create the log file and duplicate in this file all the messages
    --  generated by a tool.

lkql_checker/src/gnatcheck-output.adb

@@ -543,9 +543,7 @@ package body Gnatcheck.Output is
 
    procedure Warning (Message : String) is
    begin
-      if Arg.Warnings_As_Errors.Get or else Warning_Mode /= Quiet then
-         Error (Message);
-      end if;
+      Error (Message);
 
       --  Force a non-zero return code when "warnings as errors" is enabled
       if Arg.Warnings_As_Errors.Get then

lkql_checker/src/gnatcheck-output.ads

@@ -48,7 +48,7 @@ package Gnatcheck.Output is
    --  Sends into Stderr the error message with no tool name prefix
 
    procedure Warning (Message : String);
-   --  Same as Error, but do nothing if Warning_Mode = Quiet.
+   --  Same as ``Error``
 
    procedure Info (Message : String);
    --  Sends Message into Stderr (with no tool name prefix).