Make the mem_align routines 64-bit safe
Make the mem_align routines 64-bit safe

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