mdbx: release v0.10.5 (hotfix).
    
Acknowledgements:
-----------------
 - [Noel Kuntze](https://github.com/Thermi) for immediately bug reporting.
    
Fixes:
------
 - Fixed unaligned access regression after the `#pragma pack` fix for modern compilers.
 - Added UBSAN-test to CI to avoid a regression(s) similar to lately fixed.
 - Fixed possibility of meta-pages clashing after manually turn to a particular meta-page using `mdbx_chk` utility.
    
Minors:
-------
 - Refined handling of weak or invalid meta-pages while a DB opening.
 - Refined providing information for the @MAIN and @GC sub-databases of a last committed modification transaction's ID.
    
Signed-off-by: Leonid Yuriev <leo@yuriev.ru>


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