ISSigTool: Remove no-longer-used Int64Em unit from project.

Projects/ISSigTool.dpr

@@ -20,8 +20,7 @@ uses
   StringScanner in '..\Components\StringScanner.pas',
   ISSigFunc in '..\Components\ISSigFunc.pas',
   Shared.CommonFunc in 'Src\Shared.CommonFunc.pas',
-  Shared.FileClass in 'Src\Shared.FileClass.pas',
-  Shared.Int64Em in 'Src\Shared.Int64Em.pas';
+  Shared.FileClass in 'Src\Shared.FileClass.pas';
 
 {$APPTYPE CONSOLE}
 {$SETPEOSVERSION 6.1}

Projects/ISSigTool.dproj

@@ -81,7 +81,6 @@
         <DCCReference Include="..\Components\ISSigFunc.pas"/>
         <DCCReference Include="Src\Shared.CommonFunc.pas"/>
         <DCCReference Include="Src\Shared.FileClass.pas"/>
-        <DCCReference Include="Src\Shared.Int64Em.pas"/>
         <BuildConfiguration Include="Base">
             <Key>Base</Key>
         </BuildConfiguration>