PinyinIME: Add required library for package

Previous commit 9b32b99cbe494373b3d4ecd8976c9a4e385d745b
changed library libjni_pinyinime.so to be optional.
This change adds the library as a requirement for PinyinIME
package.

Change-Id: Ie308cc6492eed97d1780f13bc38918c138ec7572
Signed-off-by: Mark D Horn <mark.d.horn@intel.com>
diff --git a/Android.mk b/Android.mk
index 99ad14d..b0741e0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -11,6 +11,8 @@
 
 LOCAL_JNI_SHARED_LIBRARIES := libjni_pinyinime
 
+LOCAL_REQUIRED_MODULES := libjni_pinyinime
+
 LOCAL_STATIC_JAVA_LIBRARIES := com.android.inputmethod.pinyin.lib
 
 LOCAL_CERTIFICATE := shared