COMP: Fix bgq build whend building within hacc

Fixed issue with the build on the bgq(mira) when building
within hacc. The environment script on mira, "env/bashrc.mira",
does not use the mpi compiler wrapper, i.e., mpixlcxx_r, etc.
Instead, mpi is linked via the HACC_MPI_LDFLAGS. The Makefiles
for cosmotools and genericio did not use HACC_MPI_LDFLAGS.
Consequently, the build would fail due to undefined references to
MPI calls. Fixed that.

From: George Zagaris <george.zagaris@kitware.com>

git-svn-id: https://svn.alcf.anl.gov/repos/DarkUniverse/hacc/trunk/cosmotools@1711 952bdfbe-fa2e-45c0-a9ae-ac90d4a62daf
Merge branch 'svn/trunk'