Add preliminary support for Windows .manifest files

An embedded manifest file is really just XML data embedded as a RT_MANIFEST resource (ID = 24). Typically, the Windows-only 'Manifest Tool' (`mt.exe`) is used to embed manifest files, and `mt.exe` also seems to perform some transformation of the manifest data before embedding, but in testing it doesn't seem like the transformations are necessary to get the intended result.

So, to handle embedding manifest files, Zig now takes the following approach:

- Generate a .rc file with the contents `1 24 "path-to-manifest.manifest"`
- Compile that generated .rc file into a .res file
- Link the .res file into the final binary

This effectively achieves the same thing as `mt.exe` minus the validation/transformations of the XML data that it performs.

How this is used:

On the command line:
```
zig build-exe main.zig main.manifest
```
(on the command line, specifying a .manifest file when the target object format is not COFF is an error)

or in build.zig:

```
const exe = b.addExecutable(.{
    .name = "manifest-test",
    .root_source_file = .{ .path = "main.zig" },
    .target = target,
    .optimize = optimize,
});
exe.addWin32ManifestFile(.{ .path = "main.manifest" });
```
(in build.zig, the manifest file is ignored if the target object format is not COFF)

Note: Currently, only one manifest file can be specified per compilation. This is because the ID of the manifest resource is currently always 1. Specifying multiple manifests could be supported if a way for the user to specify an ID for each manifest is added (manifest IDs must be a u16).

Closes #17406

Author: squeek502

lib/std/Build/Step/Compile.zig

@@ -257,6 +257,7 @@ pub const LinkObject = union(enum) {
     c_source_file: *CSourceFile,
     c_source_files: *CSourceFiles,
     win32_resource_file: *RcSourceFile,
+    win32_manifest_file: LazyPath,
 };
 
 pub const SystemLib = struct {
@@ -952,6 +953,17 @@ pub fn addWin32ResourceFile(self: *Compile, source: RcSourceFile) void {
     source.file.addStepDependencies(&self.step);
 }
 
+pub fn addWin32ManifestFile(self: *Compile, source: LazyPath) void {
+    // Only the PE/COFF format has a Resource Table which is where the manifest
+    // gets embedded, so for any other target the manifest file is just ignored.
+    if (self.target.getObjectFormat() != .coff) return;
+
+    const b = self.step.owner;
+    const source_duped = source.dupe(b);
+    self.link_objects.append(.{ .win32_manifest_file = source_duped }) catch @panic("OOM");
+    source.addStepDependencies(&self.step);
+}
+
 pub fn setVerboseLink(self: *Compile, value: bool) void {
     self.verbose_link = value;
 }
@@ -1567,6 +1579,10 @@ fn make(step: *Step, prog_node: *std.Progress.Node) !void {
                 }
                 try zig_args.append(rc_source_file.file.getPath(b));
             },
+
+            .win32_manifest_file => |manifest_file| {
+                try zig_args.append(manifest_file.getPath(b));
+            },
         }
     }