HPCC-10978 Fix windows build break by removing use of strncasecmp

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #5497 from afishbeck/windowsStrncasecmp

HPCC-10978 Fix windows build breack by removing use of strncasecmp

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
Merge remote-tracking branch 'origin/candidate-4.2.2' into closedown-4.2.x

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>