minijail: do not use gcc designator extension.

BUG=chromium:240348
TEST=CFLAGS="clang" FEATURES="test" emerge-lumpy chromeos-minijail passes.

Change-Id: Ie56992d6e487f9badf14b62a47010fe0e7882847
Reviewed-on: https://gerrit.chromium.org/gerrit/51004
Reviewed-by: Will Drewry <wad@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
diff --git a/test_harness.h b/test_harness.h
index 931b736..9bca7f9 100644
--- a/test_harness.h
+++ b/test_harness.h
@@ -202,7 +202,7 @@
 #define _TEST(test_name) \
   static void test_name(struct __test_metadata *_metadata); \
   static struct __test_metadata _##test_name##_object = \
-    { name: "global." #test_name, fn: &test_name }; \
+    { .name= "global." #test_name, .fn= &test_name }; \
   static void __attribute__((constructor)) _register_##test_name(void) { \
     __register_test(&_##test_name##_object); \
   } \
@@ -252,8 +252,8 @@
     fixture_name##_teardown(_metadata, &self); \
   } \
   static struct __test_metadata _##fixture_name##_##test_name##_object = { \
-    name: #fixture_name "." #test_name, \
-    fn: &wrapper_##fixture_name##_##test_name, \
+    .name= #fixture_name "." #test_name, \
+    .fn= &wrapper_##fixture_name##_##test_name, \
    }; \
   static void __attribute__((constructor)) \
       _register_##fixture_name##_##test_name(void) { \