This patch fixes a core dump that occurs in mod_include during tag parsing

This patch fixes a core dump that occurs in mod_include during tag parsing
if the starting sequence (<!--#) finishes at the end of a bucket and the
directive starts at the beginning of the next bucket.

There is still a bug in the handling of conditional directives that span
buckets, but the core dump is now fixed and the conditional bug should
be even rarer than the core dump was. I'm fixing the conditional bug
seperately.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94436 13f79535-47bb-0310-9956-ffa450edef68