Melissa Jost 74072cdc80 base: Update <experimental/filesystem> include ...

This change addresses an error in the compiler tests:
https://jenkins.gem5.org/job/compiler-checks/573/

For clang versions 6 through 10, as well as GCC 7,
in order to use the "filesystem" module, you must
include the experimental namespace.  In all newer
versions, you can use the "filesystem" module as is.

Because of this, include guards to handle this. They include
"<experimental/filesystem>" for the older clang versions and
the "<filesystem>" for all other versions.

As opposed to checking by version, we now check if the
filesystem library has been defined before using it.

Change-Id: I8fb8d4eaa33f3edc29b7626f44b82ee66ffe72be
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/69778
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>

2023-04-24 23:30:01 +00:00

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