Update NLP-ENGINE in NLP Plugin to latest for compile fixes

Centos error:

07:56:10 /var/lib/jenkins/workspace/CE-Candidate-8.4.0-rc4/CE/centos-el8-x86-64-aws-ris/HPCC-Platform/plugins/nlp/nlp-engine/cs/libconsh/cg.cpp:536:22:
07:56:10 _stprintf(o_main, _T("%s%cmain.%s"), path, DIR_CH, suff);
07:56:10 _^~~~~~~~~~~~~
07:56:10 /var/lib/jenkins/workspace/CE-Candidate-8.4.0-rc4/CE/centos-el8-x86-64-aws-ris/HPCC-Platform/plugins/nlp/nlp-engine/cs/libconsh/cg.cpp:536:10: note: ‘sprintf’ output between 9 and 2056 bytes into a destination of size 256

Clang:

/home/gavin/git/hpcc/plugins/nlp/nlp-engine/cs/libprim/list.cpp:461:9: error: cannot initialize return object of type 'char *' with an rvalue of type 'long'
return((long)0);