Jean-Marc Lasgouttes 09684899d6 Clean up after removal of strfwd.h
Remove autoconf tests for whether std::string uses COW, since this is
forbidden by C++11 standard.

Forbid the use of gcc 4.9 (which still uses COW).

Remove code in debug.h that added forward declarations for LLVM's
libc++, since we do not do forward declarations anymore.

Remove configure test for libc++.
2024-10-05 15:15:21 +02:00
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