followup to segfault/builtin_expect

[David Ford]

I checked an older compile, of 2.2, and the config.log.
HAVE_BUILTIN_EXPECT is undefined in the previous compile and the
config.log shows a failure for it, however the config.h had it defined.

I undefined it and commented it out.  I'd recommed someone taking a peek
at the configure script to figure out why the failure resulted in a
success.

-d

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