Set language encoding flag when using ZIPPacker

When non-ASCII filenames are used, this indicates that the encoding is
UTF-8. Programs like ZIPReader can then parse the filename correctly.

editor/export/editor_export_platform.cpp

@@ -1431,7 +1431,7 @@ void EditorExportPlatform::zip_folder_recursive(zipFile &p_zip, const String &p_
 					nullptr,
 					0,
 					0x0314, // "version made by", 0x03 - Unix, 0x14 - ZIP specification version 2.0, required to store Unix file permissions
-					0);
+					1 << 11); // Bit 11 is the language encoding flag. When set, filename and comment fields must be encoded using UTF-8.
 
 			String target = da->read_link(f);
 			zipWriteInFileInZip(p_zip, target.utf8().get_data(), target.utf8().size());
@@ -1475,7 +1475,7 @@ void EditorExportPlatform::zip_folder_recursive(zipFile &p_zip, const String &p_
 					nullptr,
 					0,
 					0x0314, // "version made by", 0x03 - Unix, 0x14 - ZIP specification version 2.0, required to store Unix file permissions
-					0);
+					1 << 11); // Bit 11 is the language encoding flag. When set, filename and comment fields must be encoded using UTF-8.
 
 			Ref<FileAccess> fa = FileAccess::open(dir.path_join(f), FileAccess::READ);
 			if (fa.is_null()) {

modules/zip/zip_packer.cpp

@@ -72,7 +72,24 @@ Error ZIPPacker::start_file(const String &p_path) {
 	zipfi.internal_fa = 0;
 	zipfi.external_fa = 0;
 
-	int err = zipOpenNewFileInZip(zf, p_path.utf8().get_data(), &zipfi, nullptr, 0, nullptr, 0, nullptr, Z_DEFLATED, Z_DEFAULT_COMPRESSION);
+	int err = zipOpenNewFileInZip4(zf,
+			p_path.utf8().get_data(),
+			&zipfi,
+			nullptr,
+			0,
+			nullptr,
+			0,
+			nullptr,
+			Z_DEFLATED,
+			Z_DEFAULT_COMPRESSION,
+			0,
+			-MAX_WBITS,
+			DEF_MEM_LEVEL,
+			Z_DEFAULT_STRATEGY,
+			nullptr,
+			0,
+			0x0314, // "version made by", 0x03 - Unix, 0x14 - ZIP specification version 2.0, required to store Unix file permissions.
+			1 << 11); // Bit 11 is the language encoding flag. When set, filename and comment fields must be encoded using UTF-8.
 	return err == ZIP_OK ? OK : FAILED;
 }