Odd buildbot behaviour

[Joshua Root]

Regarding
<http://build.macports.org/builders/buildports-lion-x86_64/builds/199>:

The progress log is normal until here:

Building ice33-cpp (3090 of 13875)...failure
Building ice33-java (3091 of 13875)...skipping, portfile not modified
since last failure

After that, every port is skipped. Thing is, the check that would cause
ports to be skipped in this way doesn't trigger when the portlist is
'all'. See:

<https://trac.macports.org/browser/contrib/mpab/chroot-scripts/buildports>
around lines 70 and 107.

I'm not sure what could cause this apart from memory corruption or weird
shell bugs.

Then, the Gather Archives step fails like so:
./gather_archives.sh: line 33: /opt/local/bin/port: File name too long

and the cleanup step similarly contains a failure:
rm: /opt/local/var/macports/distfiles/*: File name too long

So we'd better figure out what happened and fix whatever's wrong before
we try that again.

- Josh