Bug fix: HDFFV-8954
Previously, ph5diff may hang in a test in Linux 32 platform(HDFFV-587).
No solution was available and a patch to bypass the test is implemented.

Since the company is changing domain name soon, the patch would not be valid any more.
Tests were done (repeat 100 mpiexec -np 6 ./ph5diff -v h5diff_hyper1.h5 h5diff_hyper2.h5)
and the previous hanging problem did not occur. It is likely the newer versions of
mpich no longer have this problem.  Therefore, it is decide to remove this patch
to make the test script cleaner, if nothing else.

Tested: ran build and test in Jam (linux 32) and the repeat 100 command mentioned above.
All passed.