fix problem with encoder being too strict about subset blocksizes
fix problem with encoder being too strict about subset blocksizes

waitman/flac,LordJZ/libflac,fredericgermain/flac,kode54/flac,fredericgermain/flac,Distrotech/flac,fredericgermain/flac,waitman/flac,waitman/flac,Distrotech/flac,kode54/flac,Distrotech/flac,kode54/flac,fredericgermain/flac,LordJZ/libflac,Distrotech/flac,waitman/flac,waitman/flac,kode54/flac,LordJZ/libflac,LordJZ/libflac