Remove all lines containing cvs/svn "$Id$" keyword.

This keyword is not expanded by Git which means it's not replaced with the
correct revision value in the releases made using git-based scripts and it's
confusing to have lines with unexpanded "$Id$" in the released files. As
expanding them with Git is not that simple (it could be done with git archive
and export-subst attribute) and there are not many benefits in having them in
the first place, just remove all these lines.

If nothing else, this will make an eventual transition to Git simpler.

Closes #14487.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

build/buildbot/config/include/csleobuild.xml

@@ -4,7 +4,6 @@
     Name:       include/csleobuild.xml
     Purpose:    Declarations for the csleobuild slave
     Author:     Michael Wetherel, Stefan Csomor
-    RCS-ID:     $Id$
     Copyright:  (c) Stefan Csomor
     Licence:    wxWindows licence
 -->

build/buildbot/config/include/defs.xml

@@ -4,7 +4,6 @@
     Name:       include/defs.xml
     Purpose:    Common declarations for buildbot
     Author:     Mike Wetherell
-    RCS-ID:     $Id$
     Copyright:  (c) 2007 Mike Wetherell
     Licence:    wxWindows licence
 -->

build/buildbot/config/include/push.xml

@@ -4,7 +4,6 @@
     Name:       include/push.xml
     Purpose:    Declarations for the push build slave
     Author:     Mike Wetherell
-    RCS-ID:     $Id$
     Copyright:  (c) 2007 Mike Wetherell
     Licence:    wxWindows licence
 -->

build/buildbot/config/include/unix.xml

@@ -4,7 +4,6 @@
     Name:       include/unix.xml
     Purpose:    Declarations for unix slaves
     Author:     Michael Wetherell
-    RCS-ID:     $Id$
     Copyright:  (c) Michael Wetherell
     Licence:    wxWindows licence
 -->

build/buildbot/config/include/xp_vc.xml

@@ -4,7 +4,6 @@
     Name:       include/xp_vc.xml
     Purpose:    Declarations for the xp_vc slave
     Author:     Michael Wetherell
-    RCS-ID:     $Id$
     Copyright:  (c) 2008 Michael Wetherell
     Licence:    wxWindows licence
 -->