statically linking to prebuilt libsoundio.a in msvc

unresolved external symbols: __imp___iob_func, __mingw_vfprintf, __mingw_vsnprintf

it also emits a warning, which I do not really understand:
MSVCRT.lib(std_type_info_static.obj) : warning LNK4078: multiple '.drectve' sections found with different attributes (00100A00)

using libsoundio 1.1.0
using msvc 2015 (14, update 2)

side note: dynamic linking works fine, although, it took me quite some time to realize, that i can use the .a file as if it was .lib :D