bootstrapped by `make world'. The version just built in ".."
normally won't work if the target system is not binary compatible.
The bootstrapped version has a better chance of working.
This makes the fixes and bugs in the previous 3 commits irrelevant.
Rev.1.11 was just wrong and rev.1.10 became unnecessary when
perl/perl was added to build-tools. Don't expect to build perl/usub
without using `make world' or equivalent if you don't have perl
installed.
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