Do not include defs.h or server.h in any header file

Do not include defs.h or server.h in any header file

This commit removes all inclusions of defs.h and server.h from header
files.

gdb/
2014-07-31  Gary Benson  <gbenson@redhat.com>

	* common/btrace-common.h: Do not include defs.h or server.h.
	* nat/mips-linux-watch.h: Likewise.
	* gdb-dlfcn.h: Do not include defs.h.
	* tracefile.h: Likewise.

gdb/gdbserver/
2014-07-31  Gary Benson  <gbenson@redhat.com>

	* ax.h: Do not include server.h.
	* gdbthread.h: Likewise.
	* lynx-low.h: Likewise.
	* notif.h: Likewise.