base,scons: Fixed `stats/hdf5.cc` CXXFlags to `-Wno-deprecated`

base,scons: Fixed `stats/hdf5.cc` CXXFlags to `-Wno-deprecated`

`Wno-deprecated-copy` was added to disable a warning in hdf5.cc:
https://gem5-review.googlesource.com/c/public/gem5/+/26325.

This works with GCC but does not work with clang. Clang returns
`error: unknown warning option '-Wno-deprecated-copy'; did you mean
'-Wno-deprecated'? [-Werror,-Wunknown-warning-option]` when this flag
is enabled. This flag has therefore been changed to `Wno-deprecated`.
This works in both GCC and Clang.

Change-Id: I38dd58f3007975ccb60b2eec936c3b200b3df3ca
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/31216
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>