Update to the 20130518 snapshot of GCC 4.7.4.

Introduce a new option BOOTSTRAP that allows switching between a
full bootstrap of GCC and just running a simple build.

Bootstrapping is the default upstream, and for very stable and old
flavors of GCC we disable this by default since that is a huge win
in terms of build time of the port.  No change in default behavior
for this port, for the time being we continue to bootstrap.

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