Disable the testcase for Vxworks.

Umesh Kalappa · BaoshanPang · commit 2a38eb3a86cd · 2020-01-27T09:37:57.000-08:00
diff --git a/src/test/ui/env-funky-keys.rs b/src/test/ui/env-funky-keys.rs
@@ -6,6 +6,7 @@
 // ignore-cloudabi no execve
 // ignore-emscripten no execve
 // ignore-sgx no execve
+// ignore-vxworks no execve
 // no-prefer-dynamic
 
 #![feature(rustc_private)]
