KWSys: Remove $Id$ from MD5.c

This CVS keyword was copied into the file with the rest of the
implementation.  It has no meaning outside its original project tree.

Source/kwsys/MD5.c

@@ -52,7 +52,6 @@
   [email protected]
 
  */
-/* $Id$ */
 /*
   Independent implementation of MD5 (RFC 1321).