Add missing stdlib.h includes to sim 2021-05-04 Tom Tromey <tromey@adacore.com> 2021-05-04 Tom Tromey <tromey@adacore.com> 2021-05-04 Tom Tromey <tromey@adacore.com> 2021-05-04 Tom Tromey <tromey@adacore.com> 2021-05-04 Tom Tromey <tromey@adacore.com>