Disable compiling of the descriptors directory
Disable compiling of the descriptors directory

This disables the compiling of the descriptor
applications. Not compiling them by default
will remove the OpenBabel2 dependency.

Change-Id: I04e905e3c08a0bc29e97ffdf19da5285692574fd

OpenChemistry/mongochem,OpenChemistry/mongochem,OpenChemistry/mongochem