HPCC-10957 Don't include unicode ignore codepoints in hash32 etc

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #5763 from ghalliday/issue10957

HPCC-10957 Don't include unicode ignore codepoints in hash32 etc

Reviewed-By: John Holt <john.d.holt@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>