v0.13.9 "ИС-2" (IS-2).

The supporting release of a stable branch with bug fixes,
in memory of the most powerful Soviet IS-2 tank of the Great Patriotic War.
 - Support of Harmony OS;
 - fixed assertion (BMI > 0) in debugging builds for 32-bit platforms;
 - fixed regression of DB growth (no shrinking) after using fallocate() for `SIGBUS` prevention;
 - workaround to avoid `EAGAIN` on Android after an application restart;

For more information please see [ChangeLog in the `stable` branch](https://gitflic.ru/project/erthink/libmdbx/blob?file=ChangeLog.md&branch=stable).

git diff' stat: 24 files changed, 262 insertions(+), 226 deletions(-)
Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
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