sandboxed-system-primitives: Remove unused file signals.h (#1132)

core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/signals.h

@@ -1,20 +0,0 @@
-// Part of the Wasmtime Project, under the Apache License v2.0 with LLVM
-// Exceptions. See
-// https://github.com/bytecodealliance/wasmtime/blob/main/LICENSE for license
-// information.
-//
-// Significant parts of this file are derived from cloudabi-utils. See
-// https://github.com/bytecodealliance/wasmtime/blob/main/lib/wasi/sandboxed-system-primitives/src/LICENSE
-// for license information.
-//
-// The upstream file contains the following copyright notice:
-//
-// Copyright (c) 2016 Nuxi, https://nuxi.nl/
-
-#ifndef SIGNALS_H
-#define SIGNALS_H
-
-void
-signals_init(void);
-
-#endif