MSVC patch: missing exported symbol from liboctave

[John W. Eaton]

On  4-Dec-2007, Michael Goffioul wrote:

| 2007-12-04  Michael Goffioul <michael.goffioul at gmail.com>
| 
|     * Array-util.h: export permute_vector_compare (Win32/MSVC)

Fixed.

Thanks,

jwe