[fix] Stack smasher in ACPI.

I'm attempting to make -CURRENT work on a compaq evo N800c, and am hitting
some issues.

(1) The Intel ACPICA contains a potential memory-corruption bug.

(2): The N800c AML uses idioms defined in ACPI 2.0 which the FreeBSD
implementation isn't aware of, and which interacts with (1) so as
to corrupt the stack and cause a panic.  Specifically, some objects
report their _CID in the form of a Package with multiple Integers in
it (ACPI 2.0 specification p.154 section 6.1.2).

(3): Compaq has defined _HIDs *with* leading asterisks in direct
violation of ACPI 2.0 p.156 section 6.1.4.  Growl.

The attached patch is a suggestion for a fix of (1) and the part
of (2) that interacts with (1).

I'm working on the rest of (2) and a workaround for (3).

-- B