use am_cv_ prefix to quiet autoconf warnings
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lward
In SLES11 there are a large number of autoconf/automake warnings about
variables used by AC_CACHE_VAL not having the am_cv_ prefix.
SLES11 uses autoconf 2.63, automake 1.10.1.
Attached patch (against Lustre libsysio version, but looks like it is still largely
applicable) fixes these warnings on SLES11. Also tested on RHEL4 with
autoconf 2.59, automake 1.9.2
use am_cv_ prefix to quiet autoconf warnings