Fix a discontiguous predicate warning when running the `=../2` Prolog built-in predicate tests using a backend compiler that doesn't support unbounded term arity
Fix a discontiguous predicate warning when running the `=../2` Prolog built-in predicate tests using a backend compiler that doesn't support unbounded term arity

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3