Clean up: Update variable names to comply with spec of ApplicationInfo.

ApplicationInfo.sourceDir may or may not be apk file name.  It can be a directory as well.
The spec just says it's "Full path to the location of this package".

Also, added error handling in loadDictionary().

Change-Id: I5e64d0aba4b1ec7634f4b3ac5537e7a774433ece
diff --git a/native/Android.mk b/native/Android.mk
index 38465ac..a8fe06d 100644
--- a/native/Android.mk
+++ b/native/Android.mk
@@ -32,7 +32,7 @@
 LOCAL_MODULE_TAGS := user
 
 ifeq ($(FLAG_DBG), true)
-    $(warning "Making debug build.")
+    $(warning Making debug version of native library)
     LOCAL_CFLAGS += -DFLAG_DBG
     LOCAL_SHARED_LIBRARIES := libcutils libutils
 endif