headers: remove 'AppHdr.h' include from .h files

This breaks the GCC if you're using precompiled headers, and we don't need this included in these headers anyway. All the .cc files have AppHdr.h included first anyway.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Created by  Steven Noonan  on October 8, 2009
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