wasmer: add wasi support

Author: Afirium

src/wasmer.zig

@@ -1,9 +1,11 @@
 const std = @import("std");
 const builtin = @import("builtin");
 pub const wasm = @import("./wasm.zig");
-pub const wasi = @import("./wasi.zig");
+
+pub usingnamespace @import("./wasi.zig");
 
 // Re-exports
+pub const ExternVec = wasm.ExternVec;
 pub const ByteVec = wasm.ByteVec;
 pub const Engine = wasm.Engine;
 pub const Store = wasm.Store;
@@ -14,7 +16,6 @@ pub const Func = wasm.Func;
 pub const Memory = wasm.Memory;
 pub const MemoryType = wasm.MemoryType;
 pub const Limits = wasm.Limits;
-pub const WasiConfig = wasi.WasiConfig;
 
 const OS_PATH_MAX: usize = switch (builtin.os.tag) {
     .windows => std.os.windows.MAX_PATH,