Bug 1286527 - Add sys_semop to seccomp whitelist. r=gcp

security/sandbox/linux/SandboxFilter.cpp

@@ -467,6 +467,7 @@ public:
     case SHMDT:
     case SEMGET:
     case SEMCTL:
+    case SEMOP:
       return Some(Allow());
     default:
       return SandboxPolicyCommon::EvaluateIpcCall(aCall);