Fix breakage of SSH-2 packet decompression by r10070.

The line that resets st->pktin->length to cover only the semantic
payload of the SSH message was overwriting the modification to
st->pktin->length performed by the optional decompression step. I
didn't notice because I don't habitually enable compression.


git-svn-id: svn://svn.tartarus.org/sgt/putty@10103 cda61777-01e9-0310-a592-d414129be87e
Include another autoconf dropping in svn:ignore.


git-svn-id: svn://svn.tartarus.org/sgt/putty@10104 cda61777-01e9-0310-a592-d414129be87e