Add libstdc++ library to LD_PRELOAD path to find proper symbols

In testing we found a bug caused by loading and incompatible
C++ libary, this change forces the proper libstdc++ libary
to be used on older SmartOS machines.
Merge pull request #266 from basho/jem-stdc++-ld-path

Add libstdc++ library to LD_PRELOAD path to find proper symbols