0.11.11 "Тендра-1790"

The stable bugfix release.
It is planned that this will be the last release of the v0.11 branch.

Fixes:
------

 - Fixed an extra check for `MDBX_APPENDDUP` inside `mdbx_cursor_put()` which could result in returning `MDBX_EKEYMISMATCH` for valid cases.
 - Fixed an extra ensure/assertion check of `oldest_reader` inside `mdbx_txn_end()`.
 - Fixed derived C++ builds by removing `MDBX_INTERNAL_FUNC` for `mdbx_w2mb()` and `mdbx_mb2w()`.

For earlier versions please refer to the git's tags and the [ChangeLog](https://gitflic.ru/project/erthink/libmdbx/blob?file=ChangeLog.md).

10 files changed, 38 insertions(+), 21 deletions(-)
Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
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