scons: Remove -Werror for the gem5 v21.2 release

While gem5 compiles on our supported compilers, removing the -Werror
flag on the stable branch ensures that, as new compilers are released
with stricter warnings, gem5 remains compilable.

Change-Id: I05989356997bc7f6606c43944d15da6c3958a3f5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54463
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed