message: Fix run.sh with no target (use native system)
diff: @@ -7,7 +7,12 @@ set -e
  HERE=`dirname $0`
  -RUST_BACKTRACE=1 cargo run --manifest-path $HERE/Cargo.toml --quiet -- -t $TARGET -o tmp_run.o
  -cc -target $TARGET -o tmp_run tmp_run.o $HERE/rt.o
  +if [ -n "$TARGET" ]; then
  + CFLAGS="-target $TARGET"
  + BFLAGS="-t $TARGET"
  +fi
  +
  +RUST_BACKTRACE=1 cargo run --manifest-path $HERE/Cargo.toml --quiet -- $BFLAGS -o tmp_run.o
  +cc $CFLAGS -o tmp_run tmp_run.o $HERE/rt.o
  ./tmp_run $@
  rm tmp_run.o tmp_run
  