Provide template for CPack Cygwin generator specific variables.

Modules/CPackCygwin.cmake

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+##section Variables specific to CPack Cygwin generator
+##end
+##module
+# - Cygwin CPack generator (Cygwin).
+# The following variable is specific to installers build on
+# and/or for Cygwin:
+##end
+#
+##variable
+#   CPACK_CYGWIN_PATCH_NUMBER - The Cygwin patch number.
+#   FIXME: This documentation is incomplete.
+##end
+##variable
+#   CPACK_CYGWIN_PATCH_FILE - The Cygwin patch file.
+#   FIXME: This documentation is incomplete.
+##end
+##variable
+#   CPACK_CYGWIN_BUILD_SCRIPT - The Cygwin build script.
+#   FIXME: This documentation is incomplete.
+##end
+
+#=============================================================================
+# Copyright 2006-2012 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)