After implementing support for chunk-encoded request bodies
for Privoxy, the curl tests 565 and 1333 kept failing when
using Privoxy as proxy anyway.

The problem seems to be that curl doesn't properly chunk-encode
content-free request bodies and sends "CR LF 0 CR LF CR LF"
instead of "0 CR LF CR LF" ("last-chunk" + CR LF).

The tests work without Privoxy because they expect the stray
CR LF at the beginning of the body.

The attached patch fixes this.

Fabian

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