Update JNI code in preparation for ICU 59 switching to C++11 char16_t.

am: 253e515259

Change-Id: I064ae78ad17bef67d6e90c7ce0aed4e9693c9ac6

core/jni/android_text_AndroidBidi.cpp

@@ -42,7 +42,7 @@ static jint runBidi(JNIEnv* env, jobject obj, jint dir, jcharArray chsArray,
             // Set callbacks to override bidi classes of new emoji
             ubidi_setClassCallback(
                     bidi, minikin::emojiBidiOverride, nullptr, nullptr, nullptr, &status);
-            ubidi_setPara(bidi, chs, n, dir, NULL, &status);
+            ubidi_setPara(bidi, reinterpret_cast<const UChar*>(chs), n, dir, NULL, &status);
             if (U_SUCCESS(status)) {
                 for (int i = 0; i < n; ++i) {
                   info[i] = ubidi_getLevelAt(bidi, i);