Update to 7.9.8.
For some reason, this segfaults badly on sparc64, or at least on the
only sparc64 machine that I have access to (thanks mike!). I'll deal
with this later; for the present, let the x86 and Alpha users benefit
from the new cURL features and bugfixes :)
Submitted by: Ying-Chih Kuo <email@example.com>