Revert about half of the last commit because of an oversight on my part

Revert about half of the last commit because of an oversight on my part
that broke it.  Unfortunately, fixing the oversight "the right way" is
almost as ugly as the original code; it's easier to just go back to the way
it was, at least for now.

The problem is that the original code would delete buckets from foo through
bar in the brigade, and the patched code deletes *everything* up through
bar, which is bad.  I could have fixed it by doing two splits, but that
introduces too many palloc's for my taste.  It's also fixable with RING macros,
but I refuse to start using RING macros directly on brigades.  The best
solution would be if there were a brigade equivalent to a RING_UNSPLICE/
RING_INSERT_HEAD sequence (this sequence is also used interally by
apr_brigade_split(), btw), something like this:
APR_BRIGADE_TRANSFER_BUCKETS(oldbrigade,newbrigade,startbucket,endbucket);

Absent that, the affected parts of the patch are hereby reverted (grumble,
grumble).  If people liek the APR_BRIGADE_TRANSFER_BUCKETS() idea, I'll
implement that and repatch mod_include later.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88909 13f79535-47bb-0310-9956-ffa450edef68