Add the main body of the forwarding executable.

Change-Id: I76a3336df185a8e5773f6563c104658632ef89bf

CMake/vtk-forward.c.in

+/*=========================================================================
+
+Program:   VTK
+Module:    vtk-forward.c.in
+
+Copyright (c) Kitware, Inc.
+All rights reserved.
+See Copyright.txt or http://www.vtk.org/HTML/Copyright.html for details.
+
+This software is distributed WITHOUT ANY WARRANTY; without even
+the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+PURPOSE.  See the above copyright notice for more information.
+
+=========================================================================*/
+
+#define vtksys_SHARED_FORWARD_DIR_BUILD "@VTK_FORWARD_DIR_BUILD@"
+#define vtksys_SHARED_FORWARD_PATH_BUILD @VTK_FORWARD_PATH_BUILD@
+#define vtksys_SHARED_FORWARD_PATH_INSTALL @VTK_FORWARD_PATH_INSTALL@
+#define vtksys_SHARED_FORWARD_EXE_BUILD "@VTK_FORWARD_DIR_BUILD@/@VTK_FORWARD_EXE@"
+#define vtksys_SHARED_FORWARD_EXE_INSTALL "@VTK_FORWARD_DIR_INSTALL@/@VTK_FORWARD_EXE@"
+#define vtksys_SHARED_FORWARD_OPTION_PRINT "--print"
+#define vtksys_SHARED_FORWARD_OPTION_LDD "--ldd"
+
+#include <vtksys/SharedForward.h>
+
+int main(int argc, char** argv)
+{
+  return vtksys_shared_forward_to_real(argc, argv);
+}