Fix UnsatisfiedLinkError for Latin IME. Don't use old NDK version in a platform build.

Also added a clean step, since it's only a Makefile change.

Change-Id: Ide1684a5f34e99496e969edb8443dc4545b57306
diff --git a/native/Android.mk b/native/Android.mk
index b294469..e9ceceb 100644
--- a/native/Android.mk
+++ b/native/Android.mk
@@ -8,8 +8,8 @@
 	src/dictionary.cpp \
 	src/char_utils.cpp
 
-LOCAL_NDK_VERSION := 4
-LOCAL_SDK_VERSION := 8
+#LOCAL_NDK_VERSION := 4
+#LOCAL_SDK_VERSION := 8
 
 LOCAL_MODULE := libjni_latinime