update build.zig API usage

test/link/macho/objcpp/build.zig

@@ -2,16 +2,18 @@ const std = @import("std");
 const Builder = std.build.Builder;
 
 pub fn build(b: *Builder) void {
-    const mode = b.standardReleaseOptions();
+    const optimize = b.standardOptimizeOption(.{});
 
     const test_step = b.step("test", "Test the program");
 
-    const exe = b.addExecutable("test", null);
+    const exe = b.addExecutable(.{
+        .name = "test",
+        .optimize = optimize,
+    });
     b.default_step.dependOn(&exe.step);
     exe.addIncludePath(".");
     exe.addCSourceFile("Foo.mm", &[0][]const u8{});
     exe.addCSourceFile("test.mm", &[0][]const u8{});
-    exe.setBuildMode(mode);
     exe.linkLibCpp();
     // TODO when we figure out how to ship framework stubs for cross-compilation,
     // populate paths to the sysroot here.