Tab#cxxstdlib: remove default stdlib

Fixes #23089.
Tab#cxxstdlib: don't try to convert nil to_sym
Fix test failure for C++ stdlib.
basex 7.7.2

Closes #23100.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
mongodb: add patch for clang failure.

Closes #22696.