Update for changes to zig build system

Author: ratfactor

build.zig

@@ -7,13 +7,16 @@ pub fn build(b: *std.build.Builder) void {
     // for restricting supported target set are available.
     const target = b.standardTargetOptions(.{});
 
-    // Standard release options allow the person running `zig build` to select
+    // Standard optimize options allow the person running `zig build` to select
     // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
-    const mode = b.standardReleaseOptions();
+    const optimize = b.standardOptimizeOption(.{});
 
-    const exe = b.addExecutable("zigish", "src/main.zig");
-    exe.setTarget(target);
-    exe.setBuildMode(mode);
+    const exe = b.addExecutable(.{
+        .name = "zigish",
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
     exe.install();
 
     const run_cmd = exe.run();