Make libnativehelper stand-alone.

Bug: 6369821
Change-Id: I502211bddaf60d6097b81b35f606bbcdd1a3e092
diff --git a/include/nativehelper/JNIHelp.h b/include/nativehelper/JNIHelp.h
index f5666f2..446a710 100644
--- a/include/nativehelper/JNIHelp.h
+++ b/include/nativehelper/JNIHelp.h
@@ -37,7 +37,8 @@
 
 /*
  * Register one or more native methods with a particular class.
- * "className" looks like "java/lang/String".
+ * "className" looks like "java/lang/String". Aborts on failure.
+ * TODO: fix all callers and change the return type to void.
  */
 int jniRegisterNativeMethods(C_JNIEnv* env, const char* className, const JNINativeMethod* gMethods, int numMethods);