OLMIS-4800, add exec perm to build script
OLMIS-4800, add exec perm to build script

Apparently SourceTree and CLI git don't play well together.

OpenLMIS/openlmis-referencedata,OpenLMIS/openlmis-referencedata,OpenLMIS/openlmis-referencedata,OpenLMIS/openlmis-referencedata