Define ddxBeforeReset stubs in platform-neutral DDXs

XWin uses ddxBeforeReset, which is called in DIX.  Other DDXs need to
define these in order to avoid an undefined symbol error at link time
when building alongside XWin.  Xnest and Xvfb already provide empty stubs;
this does the same for Xdmx and the platform-neutral KDrive servers.

Also add a prototype to avoid a warning in all DDXs.

Signed-off-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
Signed-off-by: Keith Packard <keithp@keithp.com>

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