defstruct ignores package lock when compiling

[Stas Boukarev]

Running (defstruct list) through compile-file gets

The value NIL is not of type SB-KERNEL:LAYOUT.

; (SB-KERNEL::%COMPILER-DEFSTRUCT '#<SB-KERNEL:DEFSTRUCT-DESCRIPTION LIST>
; '#(#<SB-KERNEL:LAYOUT for T {100009EEC3}>
; #<SB-KERNEL:LAYOUT for STRUCTURE-OBJECT
; {100009EF33}>))
;
; caught WARNING:
; change in superclasses of class #<SB-KERNEL:STRUCTURE-CLASSOID LIST>:
; The current superclasses: (T SEQUENCE)
; the most recently loaded superclasses: (T STRUCTURE-OBJECT)

[Stas Boukarev (stassats)]

In 574195b76478ccf6c407a0d8f32c60870a9d5623