Late erratum for gcc.
---------------------

For a long while, I've seen a bunch of failures in the gcc torture
tests.  Because I've seen them for so long, I've not been concerned.
Now, while comparing my results in the tests for packages in the
new build method (what will be LFS-10) I've discovered that these
failures are general.

Long story short: if gcc is compiled with -O3, a bunch of the torture
tests will fail.  So I've belatedly moved to using -O2 for gcc.