Murmur3 is incompatible with C++ reference implementation for negative seed values

[oertl]

It seems that the Murmur3 implementation has the same problem as that in Guava (see google/guava#3493).

[gzm55]

@oertl now the negative seeds can pass ut with the latest guava (31.0.1-jre). The implementation of this project decides to keep compatible with the upstream guava version, and we should have to wait the decision from google/guava#3493.

[oertl]

The same bug also existed in Apache Commons Codec where it was fixed in version 1.14, see https://issues.apache.org/jira/browse/CODEC-264.