mfhdf symbols

### i686-w64-mingw32.static

$ nm i686-w64-mingw32.static/lib/libmfhdf.a | grep "SDfileinfo"
00000390 T _SDfileinfo

### i686-w64-mingw32.shared

$ nm ./i686-w64-mingw32.shared/bin/libmfhdf-0.dll | grep "SDfileinfo"
6710aa00 T _SDfileinfo

$ nm ./i686-w64-mingw32.shared/lib/libmfhdf.dll.a | grep "SDfileinfo"
00000000 I __imp__SDfileinfo
00000000 T _SDfileinfo