Remove All CVS Id Strings Possible Using a Script

Script does what is expected and tries to do it as
smartly as possible.

+ remove occurrences of two blank comment lines
  next to each other after Id string line removed.
+ remove entire comment blocks which only exited to
  contain CVS Ids
+ If the processing left a blank line at the top of
  a file, it was removed.

c/src/configure.ac

@@ -1,6 +1,5 @@
 ## Process this file with autoconf to produce a configure script.
 ##
-## $Id$
 
 AC_PREREQ([2.68])
 AC_INIT([rtems-c-src],[_RTEMS_VERSION],[http://www.rtems.org/bugzilla])