Make libankihelper a universal library

We were shipping a single arch library in a purelib, leading to
breakages when running on a different platform.

qt/mac/helper_build.py

@@ -11,19 +11,32 @@ out_dylib, *src_files = sys.argv[1:]
 out_dir = Path(out_dylib).parent.resolve()
 src_dir = Path(src_files[0]).parent.resolve()
 
-if platform.machine() == "arm64" and not os.environ.get("MAC_X86"):
+# Build for both architectures
-    target = "arm64-apple-macos11"
+architectures = ["arm64", "x86_64"]
-else:
+temp_files = []
-    target = "x86_64-apple-macos10.14"
 
-args = [
+for arch in architectures:
-    "swiftc",
+    target = f"{arch}-apple-macos11"
-    "-target",
+    temp_out = out_dir / f"temp_{arch}.dylib"
-    target,
+    temp_files.append(temp_out)
-    "-emit-library",
+    
-    "-module-name",
+    args = [
-    "ankihelper",
+        "swiftc",
-    "-O",
+        "-target",
-]
+        target,
-args.extend(src_dir / Path(file).name for file in src_files)
+        "-emit-library",
-subprocess.run(args, check=True, cwd=out_dir)
+        "-module-name",
+        "ankihelper",
+        "-O",
+    ]
+    args.extend(src_dir / Path(file).name for file in src_files)
+    args.extend(["-o", str(temp_out)])
+    subprocess.run(args, check=True, cwd=out_dir)
+
+# Create universal binary
+lipo_args = ["lipo", "-create", "-output", out_dylib] + [str(f) for f in temp_files]
+subprocess.run(lipo_args, check=True)
+
+# Clean up temporary files
+for temp_file in temp_files:
+    temp_file.unlink()