Help: Update cmake.org links to avoid redirects

Some links to cmake.org now redirect, so link to the new pages directly.

Auxiliary/cmake-indent.vim

@@ -16,7 +16,7 @@
 " Version:      $Revision$
 "
 " Licence:      The CMake license applies to this file. See
-"               http://www.cmake.org/HTML/Copyright.html
+"               http://www.cmake.org/licensing
 "               This implies that distribution with Vim is allowed
 
 if exists("b:did_indent")

Auxiliary/cmake-syntax.vim

@@ -16,7 +16,7 @@
 " Version:      $Revision$
 "
 " Licence:      The CMake license applies to this file. See
-"               http://www.cmake.org/HTML/Copyright.html
+"               http://www.cmake.org/licensing
 "               This implies that distribution with Vim is allowed
 
 " For version 5.x: Clear all syntax items

Help/manual/LINKS.txt

@@ -11,12 +11,12 @@ Frequently Asked Questions
  A Wiki is provided containing answers to frequently asked questions.
 
 Online Documentation
- http://www.cmake.org/HTML/Documentation.html
+ http://www.cmake.org/documentation
 
  Links to available documentation may be found on this web page.
 
 Mailing List
- http://www.cmake.org/HTML/MailingLists.html
+ http://www.cmake.org/mailing-lists
 
  For help and discussion about using cmake, a mailing list is
  provided at cmake@cmake.org.  The list is member-post-only but one