Log Message:
finance/ledger32: Fix build with boost>=1.86, and fix ctype abuse.

1. Boost patch backported from upstream master, since there's been no
   upstream release since the breakage.

2. Ctype abuse adapted afresh -- not sure how I missed this last time
   around!  Almsot all the tests pass now, and the same handful of test
   that fail fail in finance/ledger too (RegressTest_553,
   RegressTest_BF3C1F82-2, RegressTest_BF3C1F82).

No revbump because this has been broken since the revbump last month
for boost 1.86.