Add copyright notice to (Unix|Windows)Paths.cmake

This commit adds our copyright notice to these non-trivial platform
modules.

Modules/Platform/UnixPaths.cmake

@@ -1,3 +1,17 @@
+
+#=============================================================================
+# Copyright 2006-2009 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 distributed this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
 SET(UNIX 1)
 
 # also add the install directory of the running cmake to the search directories

Modules/Platform/WindowsPaths.cmake

@@ -1,3 +1,17 @@
+
+#=============================================================================
+# Copyright 2006-2009 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 distributed this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
 # Add the program-files folder(s) to the list of installation
 # prefixes.
 #