Cleanup varobj children handling

[Vladimir Prus]

This patch changes varobj.c to use VEC for hodling children, thereby making three
functions unnecessary. No regressions in MI tests. OK?

- Volodya

	gdb/
	* varobj.c: Include "vec.h". 
	(varobj_p): New typedef, declare vector of those.
	(struct varobj): Use vector for the 'children' member.
	(child_exists): Remove.
	(save_child_in_parent): Remove.
	(remove_child_from_parent): Remove.
	(varobj_list_children): Adjust to work work vector.
	(varobj_update): Likewise.
	(delete_variable_1): Likewise.
	* Makefile.in (varobj.o): Update dependencies.

	testsuite/
	* gdb.mi/mi-var-child.exp: Adjust to the change in order
	of varobjs reported by -var-update.
	* gdb.mi/mi2-var-child.exp: Likewise.
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