vchoi_fork

[svn-r8884] Purpose:
Bug fix

Description:
It uses the value of $ARCH as a gcc option but the linux clusters
at NCSA define $ARCH as environment variable with values that are
not a valid compiler option.  That caused the configure to fail
because it was not able to compile at all.

Solution:
Change ARCH to lower case $arch (convention dictates environment
variables are upper cases.)  Also preset $arch to null and do not
honor any pass it values.

Platforms tested:
Attempted to run h5committest but sol was failing due to /tmp
filled.  Copper and verbena passed.  Also passed in TG-NCSA.

Misc. update: