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For tests that call pthread routines, add an explicit dependency.
This was not an issue previously, because either the compile wrappers
always added -lpthread, or the linker discovered the pthread symbols
via an interlibrary dependency on libmpi. However on FreeBSD 10, the
interlibrary dependency resolution appears more strict. Applications
must specify any libraries directly used, thus this fix.
Signed-off-by: Halim Amer <aamer@anl.gov>