base,scons: `-wno-deprecated-copy` added for hdf5.cc with GCC

base,scons: `-wno-deprecated-copy` added for hdf5.cc with GCC

As highlighted by Ciro here:
https://gem5-review.googlesource.com/c/public/gem5/+/31216, and
here: https://gem5.atlassian.net/browse/GEM5-365,  It appears that GCC
versions >= 9 requires `-wno-deprecated-copy` which was removed in
commit: https://gem5-review.googlesource.com/c/public/gem5/+/31216.
`-wno-deprecated-copy` appears to work for all versions of GCC. Clang
does not require `-wno-deprecated-copy` nor `-wno-deprecated` for
sucessfull compilation. Therefore branching has been introduced to the
SConscript to address this and simplify the solution.

Change-Id: I233b32aa945d479dd429bb5591272608ba342d8d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/31754
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>