Reenable basic_signal:trap_signal_test on i386
This is fixed in dc4a2d1d0e838579f21d9d1fef8655f902f06ab2
PR: 265889
Sponsored by: The FreeBSD Foundation
MFC with: dc4a2d1d0e838579f21d9d1fef8655f902f06ab2
(cherry picked from commit 9ea2716b7758b72725b932f1ad9f3457a69cbea6)