libssh and Visual C++ (again)

[Christophe Baribaud]

The same patches as before, using git

0001-Finds-zlib-in-a-debug-only-build-windows.patch
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0002-MSVC-Windows-and-winsock2.h.patch

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0003-ssize_t-renamed-to-ssh_ssize_t-to-avoid-conflicts.patch

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