Matt McCormick b5e2265fc3 ExternalProject: Reattempt download when verification fails. ...

When downloading an URL with ExternalProject, reattempt the download three
times if the file hash verification fails.

The re-attempt is limited to non-local URL's.  The same download CMake script
is re-used after removing any file that resulted from the previous download
attempt.  Up to three re-attempts are performed.

2014-01-15 16:31:23 -05:00

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