BZ 5012: Add FAQ entry for compiling with optimization

[Ulrich Drepper]

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Andreas Jaeger wrote:
> Is it ok to commit this one?

I commented on this when it was submitted.  This is not enough and the
proposed text is somewhat misleading.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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