An array of pointers isn't conformant on 64-bit and will overrun the
destination buffer when unmarshalling. Since the purpose of this
function is to test a conformant FC_BOGUS_STRUCT, use one that is
conformant on both 32-bit and 64-bit.

The revised test coincidentally reveals that there is a problem with the
padding or alignment after a marshalled 16-bit enum, which will need to
be addressed separately.
Co-authored-by: Zebediah Figura <z.figura12@gmail.com>

To avoid *.sys matching windows.system.profile.systemmanufacturers.dll.

As create_free_block is only called in other places where it is not
possible to have a free block either before or after.

And rename HEAP_CreateSubHeap to create_subheap.