make MPI make more robust

[wds15]

Description

The MPI build currently has problems whenever older boost version are on a given system as the wrong boost serialization is linked in.

Example

For bug reports:

Install an old boost on your system and build any of the mpi tests. These will be linked against the old boost serialization which causes problems.

Expected Output

All binaries should be linked against the bundled boost libraries only

Additional Information

Any additional information goes here.

Current Math Version

v2.18.0

[SteveBronder]

@wds15 is this still an issue?