Only use __int64 on MSVC, not on all win32 compilers
Only use __int64 on MSVC, not on all win32 compilers

jiangjianping/vo-amrwbenc,BelledonneCommunications/vo-amrwbenc,mstorsjo/vo-amrwbenc,jiangjianping/vo-amrwbenc,Distrotech/vo-amrwbenc,mstorsjo/vo-amrwbenc,Distrotech/vo-amrwbenc,BelledonneCommunications/vo-amrwbenc,Distrotech/vo-amrwbenc