initialize WASI stdio handles to invalid for better error handling

[lum1n0us]

fix #4081

[lxbxl]

我开始也是用 os_get_invalid_handle 函数，后面发现它返回的是 os_file_handle 类型，而 stdio 是 os_raw_file_handle 类型。

所以我改成下面这样的。

#if WASM_ENABLE_LIBC_WASI != 0 && defined(BH_PLATFORM_WINDOWS)
module->wasi_args.stdio[0] = INVALID_HANDLE_VALUE;
module->wasi_args.stdio[1] = INVALID_HANDLE_VALUE;
module->wasi_args.stdio[2] = INVALID_HANDLE_VALUE;
#endif

[TianlongLiang]

LGTM

[wenyongh]

In windows platform, the os_raw_file_handle type is defined as HANDLE type, and the invalid value is INVALID_HANDLE_VALUE, refer to:

wasm-micro-runtime/core/shared/platform/windows/platform_internal.h

Line 181 in d9c01b3

typedef HANDLE os_raw_file_handle;

wasm-micro-runtime/core/shared/platform/windows/win_file.c

Line 396 in d9c01b3

HANDLE raw_dir_handle = INVALID_HANDLE_VALUE;

So here it seems we had better add macro to control the code? Some what like:

#ifndef BH_PLATFORM_WINDOWS
    module->wasi_args.stdio[0] = -1;
    module->wasi_args.stdio[1] = -1;
    module->wasi_args.stdio[2] = -1;
#else
    module->wasi_args.stdio[0] = INVALID_HANDLE_VALUE;
    module->wasi_args.stdio[1] = INVALID_HANDLE_VALUE;
    module->wasi_args.stdio[2] = INVALID_HANDLE_VALUE;
#endif