ext: Fix compilation of the sst gem5 integration.

Replace the old copied version of gem5's main function with an updated
copy. This fixes compilation, but there's still a problem running an sst
example where there's a segfault inside the python interpreter.

Change-Id: I95714a9264636c14e1dda3174bc0d79e3d881727
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54006
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54266
2 files changed