Patches for MSVC

[Michael Goffioul]

Here are 2 patches that make octave partially compilable with MSVC.
The first one should be safe and only contains generic fixes (not MSVC
specific). Most of the the proposed changes have been mentioned in
my previous mails.

The second one contains a couple of additional fixes for MSVC. As these
are MSVC specific, I don't intend to apply it to the octave source tree. This
is only given for reference.

Any objection to apply the first patch?

Michael.

msvcfix.diff
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msvcfix_specific.diff
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