Log Message:
xargs(1) on Interix is broken. It executes the utility on the command line
even if standard input is the empty string. Install a wrapper script
bundled with pkgtools/bootstrap-extras to deal with this. This is an
attempt at a permanent workaround for the problem described in PR pkg/25777
which has regressed since it was initially fixed.

We can now bootstrap again on Interix 3.5.