Wrap bild log at the terminal-supplied width

Apparently `$COLUMNS` is a POSIX standard, which allows us to set the print
width to however wide the user's terminal is. This is a better UI on both wide
and narrow terminal layouts: on very narrow layouts, the terminal will properly
clear the line instead of doing the wrap-print thing it does when the line
overflows, and on wide layouts you can see more of the log message if you're
curious. This only works if you export `$COLUMNS` though, because bash only sets
the variable in interactive mode, so by default a running program doesn't see it.

<https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html>

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