HPCC-9883 OSX RPATH Fixing for Plugins

Fixes HPCC-9883

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4757 from GordonSmith/HPCC-9883-OSX_Plugin_Patching

HPCC-9883 OSX RPATH Fixing for Plugins

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>