C++ and MSVC patch

Hi,

The attached patch should makes it easier
to include libmdb in C++ projects and
Win32 projects for people using MSVC.

It makes mdbtools.h C++ aware, and
tidies up some of the types so we aren't
comparing values of dissimilar type.

It also uses a const for a value that's used
as an array length (for MSVC) and const for
a the mdb_open filename parameter, to make
using the function easier in certain contexts.

Martin

cppmsvc.diff
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