media: Update to zig 0.16.0, harden tests and add test build step

packages/media/build.zig

@@ -1,15 +1,23 @@
 const std = @import("std");
 
 pub fn build(b: *std.Build) void {
-    const vm_dep = b.dependency("vecmath", .{});
-    const vm_module = vm_dep.module("vecmath");
+    const target = b.standardTargetOptions(.{});
 
-    const root_module = b.addModule("media", .{
+    const vm_dep = b.dependency("vecmath", .{
+        .target = target,
+    });
+    const vm_mod = vm_dep.module("vecmath");
+
+    const mod = b.addModule("media", .{
         .root_source_file = b.path("src/root.zig"),
+        .target = target,
         .link_libc = true,
+        .imports = &.{
+            .{ .name = "vecmath", .module = vm_mod },
+        },
     });
 
-    root_module.addCSourceFile(.{
+    mod.addCSourceFile(.{
         .file = b.path("src/stbi/stb_image.c"),
         .flags = &.{
             "-std=c17",
@@ -19,5 +27,12 @@ pub fn build(b: *std.Build) void {
         .language = .c,
     });
 
-    root_module.addImport("vecmath", vm_module);
+    const mod_tests = b.addTest(.{
+        .root_module = mod,
+    });
+
+    const run_mod_tests = b.addRunArtifact(mod_tests);
+
+    const test_step = b.step("test", "Run tests");
+    test_step.dependOn(&run_mod_tests.step);
 }