This is a cosmetic change only, and doesn't touch any real code.

	This is a cosmetic change only, and doesn't touch any real code.

	* amd/amd.h: introduced two new types, wchan_t and opaque_t, as
	aliases of voidp. This makes reading the code easier on the eyes. :)

	* ALL: replace various instances of voidp with wchan_t and
	opaque_t, as appropriate