[cmake] Turn off -Werror=extra -Werror=pedantic #360
Merged
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In no universe should Werror be enabled in end-user builds (rather than just developers local builds and CI checks), and certainly not for warning categories that Drake's own CI doesn't even enable. We don't want this repository to be a warning-catcher for Drake code.
The easy fix for now is to just turn off the overly broad warning categories. This does not fix the bug that Werror=all is enabled for builds triggered by downstream users.
This change is