backends/brass/: Eliminate brass_doclen_t in favour of just using
Xapian::termcount.

git-svn-id: file:///home/xapian-svn/xapian/trunk@18223 6b2f1b92-a4f3-0310-943f-de3cbe41748b
tests/harness/testrunner.h: Drop "flint" flag - flint was removed
from trunk some time ago.

git-svn-id: file:///home/xapian-svn/xapian/trunk@18224 6b2f1b92-a4f3-0310-943f-de3cbe41748b