std::string shouldn't be used inside mdbx::buffer

[erthink]

libmdbx/mdbx.h++

Lines 807 to 813 in 7d54518

	/* FIXME: replace std::string with custom silo.
	* The std::string<char> does not guarantee any alignment for allocated
	* buffer. For instance short values may be stored within internal inplace
	* buffer, which might odd address. Moreover, allocator for the `char` type
	* may return unaligned/odd address. This may UB for placing a 32-bit and
	* 64-bit values.
	* So seems the std::string<> should be replaced with ad hoc solution. */

[erthink]

This affects the alignment of a buffer(s) with the CLANG's C++ standard library.

[erthink]

Fixed in the devel branch by bd2bb51.

[erthink]

Fixed now in the master branch and v0.10.2.