Dispatch iOS 14.0 Beta 4 to Beta 5 API Differences

workgroup_object.h
Modified os_workgroup_create_with_workgroup()
Declaration
Fromos_workgroup_t os_workgroup_create_with_workgroup(const char *name, os_workgroup_t wg)
Toos_workgroup_t os_workgroup_create_with_workgroup(const char *name, os_workgroup_t wg)