Umka API doesn't work well under Windows with MSVC

[skejeton]

If you use the umkaGetAPI function to get the Umka API vtable, any call performed on it will crash the program, even calls that don't require any parameters (ex. api->umkaGetVersion()). If you opt to use the DLL option, simple calls like umkaGetVersion() will work just fine, but calls that require Umka context will crash (ex. umkaAllocData(umka, size, free)) will crash it.

I suspect it's specific of how MSVC works, or the umka pointer is not actually valid (gotten from result)

Repository to reproduce this issue: https://github.com/skejeton/umka-dynimport

[vtereshkov]

@skejeton It should be

void *umka = result->ptrVal;

but not

void *umka = (void *)result;