Instead just duplicate the common fields. These fields had to
be duplicated for the C interface compatibility anyway - but
this way there is no risk to accidentally introduce an ABI
break since there is no need for the layout of SEncParamBase to
actually match the start of SEncParamExt.
MSVC only got stdbool.h in MSVC 2013; provide a manual typedef
for this compiler instead.
The C interface test makes sure that this doesn't break the ABI.
Add a struct that matches the C++ interface vtable.
This requires that the C++ interface methods are declared to use
the same calling convention as normal C functions, and that the
C struct exactly matches the layout and ordering of the C++
virtual table - MSVC seemed to reorder methods if there were
overloaded methods.
This is required to make the order in the C++ virtual table
consistent in MSVC - previously the overloaded methods were
ordered differently in the vtable compared to the interface
declaration.