disabling -fstrict-aliasing @ -O2 by default

["Blair Sadewitz" <blair.sadewitz%gmail.com@localhost>]

I've been noticing lately that a lot of major software packages
(firefox, gtk2, lots of other GNOME libraries, and a lot more) do
type-punning.
There're probably way more packages that do this that I haven't seen
due to simply not being at the console to see the warnings.

I'm wondering whether or not this one optimization is worth the
headaches it could cause.  I've already removed it from the -O2
options list in my tree and am going to do a bulk build soon; I'm
curious to see if anything is more stable.

At any rate, I think that the 'average user' (assume that this
construct is real for the sake of argument, or that it represents me,
heh) would rather one optimization than gain a myriad of bugs.

Comments?

--Blair

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