Adopt the LZMA2 reduced dictionary set which includes
4096 bytes to 4GB-1. Unless you have lots of RAM, most larger dictionary
sizes will be reduced by lrzip-next. See open_stream_out function.
control.dictSize member changed correctly to u32. Dictionary size
limited to 4GB-1 which is 32 bits wide.
0:  2*2^11, 1:  3*2^11 ( 4,096,  6,144)
2:  2*2^12, 3:  3*2^12 ( 8,192, 12,288)
4:  2*2^13  5:  3*2^13 (16,384, 24,576)
...
38: 2*2^30, 39: 3*2^30 (2,147,483,648, 3,221,225,472)
40: 2*2^31 -1 (4,294,967,295 0xFFFFFFFF)