binary load/save export for MSVC

[Thomas Kasper]

Dear Mr Eaton,

I am aware of your concern about possible implications of the term 'API'.
(http://www.cae.wisc.edu/pipermail/octave-maintainers/2007-November/005064.html)

However, looking at ls-oct-ascii.h, I find that load/save functions are 
exported via the OCTINTERP_API macro for the MSVC build, but not their binary 
counterparts in ls-oct-binary.h. Is there a rationale for this, or would you 
consider a patch like the one attached?

Thank you!

Best regards,
Thomas Kasper

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patch-export-binary-ls
Description: Binary data