Added patch for posix_memalign using boost 1.54.0

This patch codifies Issue #48 reported by Shailesh-Venugopal. I am now able to build Boost-for-Android using android-ndk-r9d with the following build command:

`./build-android.sh --boost=1.54.0 --without-libraries=python $NDKROOT`

Hope that helps others using 1.54.0