Restrict spec command to Windows only

The spec command uses reads dprojs, which we only do in windows.
So we disable the command when in linux

This is now compiling under D12, there is a strange generics error in d13

Author: agallero

tms/src/Commands/Commands.Spec.pas

@@ -18,6 +18,8 @@ implementation
 {$ENDIF}
   Deget.CoreTypes, BBYaml.Writer, XMLDoc, XMLIntf;
 
+{$IFDEF MSWINDOWS}
+
 type
   TPackageData = class
   public
@@ -816,5 +818,11 @@ destructor TPackageData.Destroy;
   Data.Free;
   inherited;
 end;
+{$ELSE}
+procedure RegisterSpecCommand;
+begin
+
+end;
+{$ENDIF}
 
 end.