consolidate download executables

build.zig

@@ -34,11 +34,7 @@ pub fn build(b: *std.build.Builder) void {
     const run_step = b.step("run", "Run the app (uplaods clipboard contents)");
     run_step.dependOn(&run_cmd.step);
 
-    const downloadexe = switch (target.getOs().tag) {
-        .linux => b.addExecutable("clipboard-download", "src/download-linux.zig"),
-        .windows => b.addExecutable("clipboard-download", "src/download-windows.zig"),
-        else => std.os.exit(1),
-    };
+    const downloadexe = b.addExecutable("clipboard-download", "src/download.zig");
 
     configureExe(downloadexe, b, target, mode, zfetch_repo);