Upgrade Zig to the latest (#913)

Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>

.github/workflows/examples.yaml

@@ -18,7 +18,7 @@ on:
 env:
   EMSDK_VERSION: "3.1.24"
   TINYGO_VERSION: "0.26.0"
-  ZIG_VERSION: "0.11.0-dev.618+096d3efae"
+  ZIG_VERSION: "0.11.0-dev.725+9bcfe55b5"
 
 concurrency:
   # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-using-concurrency-to-cancel-any-in-progress-job-or-run

imports/wasi_snapshot_preview1/testdata/zig/build.zig

@@ -7,7 +7,6 @@ pub fn build(b: *std.build.Builder) void {
     const mode = b.standardReleaseOptions();
 
     const exe = b.addExecutable("wasi", "wasi.zig");
-    exe.linkLibC(); // Temporarily force libc usage due to the std.os.isatty bug.
     exe.setTarget(CrossTarget{ .cpu_arch = .wasm32, .os_tag = .wasi });
     exe.setBuildMode(mode);
     exe.install();

imports/wasi_snapshot_preview1/testdata/zig/wasi.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const os = std.os;
 const allocator = std.heap.page_allocator;
 const preopensAlloc = std.fs.wasi.preopensAlloc;
 const stdout = std.io.getStdOut().writer();
@@ -17,10 +18,9 @@ pub fn main() !void {
             try stdout.print("./{s}\n", .{entry.name});
         }
     } else if (std.mem.eql(u8, args[1], "stat")) {
-        try stdout.print("stdin isatty: {}\n", .{std.c.isatty(0) != 0});
-        try stdout.print("stdout isatty: {}\n", .{std.c.isatty(1) != 0});
-        try stdout.print("stderr isatty: {}\n", .{std.c.isatty(2) != 0});
-        // TODO: use std.os.isatty and remove the dependency on libc after it's fixed to work on WASI target.
-        try stdout.print("/ isatty: {}\n", .{std.c.isatty(3) != 0});
+        try stdout.print("stdin isatty: {}\n", .{os.isatty(0)});
+        try stdout.print("stdout isatty: {}\n", .{os.isatty(1)});
+        try stdout.print("stderr isatty: {}\n", .{os.isatty(2)});
+        try stdout.print("/ isatty: {}\n", .{os.isatty(3)});
     }
 }