Disable stack-probes test (MAP_STACK terminate the process in a way the testsuite fails).

Index: src/test/ui/abi/stack-probes-lto.rs
--- src/test/ui/abi/stack-probes-lto.rs.orig
+++ src/test/ui/abi/stack-probes-lto.rs
@@ -3,6 +3,7 @@
 // ignore-aarch64
 // ignore-mips
 // ignore-mips64
+// ignore-openbsd
 // ignore-powerpc
 // ignore-s390x
 // ignore-sparc
