native hadoop libraries don't build properly with 64-bit OS and a 32-bit jvm

src/native/lib/Makefile.am doesn't pass along the appropriate -m32/-m64 flag while using libtool to create the shared-object which results in this problem.

Simple fix:
-AM_LDFLAGS = @JNI_LDFLAGS@
+AM_LDFLAGS = @JNI_LDFLAGS@ -m$(JVM_DATA_MODEL)