Intermittent build failures on v11 candidate with eups distrib

We are seeing frequent intermittent failures on a variety of platforms when installing the v11 candidate with eups distrib install. Repeating the command works. It doesn't seem to be evenly distributed between packages: cfitsio, meas_astrom, meas_algorithms, and obs_lsstSim have been seen multiple times. It's been seen in the release verification CI (that uses the documented user facing process of eups distrib install instead of the factory CI which uses lsstsw) and in individual user "manual" builds on lsst-dev.

Test build key: