Replace every git-clone-based dependency fetch with a plain
curl-and-extract of the corresponding tagged source archive (GitHub
repos via the wangguofang.net/github.com proxy's /archive/<ref>.tar.gz,
libxml2 via GitLab's -/archive/ endpoint), verified one at a time
bottom-up so each change stayed isolated and cheap to test against the
build cache. This avoids the git protocol/proxy round-trip per
dependency and matches the plain curl+tar pattern already used
elsewhere in this Dockerfile (boost, libaio, gmp, nettle, gnutls,
util-linux).
log4cplus keeps git clone, since it needs `git submodule update --init`
for its ThreadPool dependency, which a source archive can't provide.
Folly/Fizz/Wangle/mvfst/fbthrift/CacheLib remain untouched and
commented out.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WGpSs9pKTbvPkmFvBaWhBp
