fix open files issue and bump firesim with various fixes

build-setup.sh

@@ -96,4 +96,5 @@ $RDIR/scripts/gen-tags.sh
 cat << EOT >> env.sh
 # line auto-generated by $0
 conda activate $RDIR/.conda-env
+source $RDIR/scripts/fix-open-files.sh
 EOT

scripts/fix-open-files.sh

@@ -0,0 +1,12 @@
+
+# first, check if the system allows sufficient limits (the hard limit)
+HARD_LIMIT=$(ulimit -Hn)
+REQUIRED_LIMIT=16384
+
+if [ "$HARD_LIMIT" -lt "$REQUIRED_LIMIT" ]; then
+    echo "WARNING: Your system does not support an open files limit (the output of 'ulimit -Sn' and 'ulimit -Hn') of at least $REQUIRED_LIMIT, which is required to workaround a bug in buildroot. You will not be able to build a Linux distro with FireMarshal until this is addressed."
+fi
+
+# in any case, set the soft limit to the same value as the hard limit
+ulimit -Sn $(ulimit -Hn)
+