You created the link libstdc++.so.6 in /usr/local/MATLAB/R2013a/bin/glnxa64 to the library in your system, installed by apt-get install libstdc++6-4.4-dev .
Now try creating also a link named libstdc++.so to libstdc++.so.6 in
/usr/local/MATLAB/R2013a/bin/glnxa64.