back on apache2_0_22

[Greg Ames]

We got a second seg fault running 2.0.24 tonight with mod_include
instrumented.  Dump 4 looks like the first two, except we have the
"bbstr" variable set at key places.  It shows that Cliff is right - we
are using an empty brigade, and what we think is a bucket is a sentinel.

I put 2.0.22 back up for now.

Greg

p.s. dumps 1 & 2 are out of sync now with the httpd binary and source,
since I added the debugging code and didn't preserve the original.