Update to htscodecs v1.2.2

 - The name tokeniser now validates the stored length in the data
   stream matches the decoded length.
 - Make data types consistent in rans_compress_bound4x16.
 - Fix an endless loop in arith_dynamic and rans4x16pr involving
   X_STRIPE with 0 stripes.
 - Prevent memcpy(dest, NULL, 0) calls.
 - Reject attempts to duplicate non-existent name tokeniser
   streams.
 - Fix possible use of uninitialised memory in
   rans_uncompress_O1_4x16.
 - Improve error detection from fqzcomp's read_array function.
 - Reject fqzcomp parameters with inconsistent "sel" parameters.
 - Fix uninitialised access to element 4095 in r4x8 O0 arrays.

Author: daviesrob