The stable bugfix release.

New:
 - The `fpta_value_str(const std::string &)` has been removed to avoid accidental misuse,
   which leads to dereference of dangling pointers to `std::string` internals from `fpta_value` instances.
   Please use the `fpta_value_str(const std::string *)` or `fpta_value_str(const fptu::string_view&)` instead of it.
 - libmdbx updated to v0.11.6.
   Please refer to the [libmdbx' ChangeLog](https://github.com/erthink/libmdbx/blob/master/ChangeLog.md) for more information.

Fixes:
 - Fixed hang copy-with-compactification of a corrupted DB
   or in case the volume of output pages is a multiple of `MDBX_ENVCOPY_WRITEBUF`.
 - Fixed standalone non-CMake build on MacOS (`#include AvailabilityMacros.h>`).
 - Fixed unexpected `MDBX_PAGE_FULL` error in rare cases with large database page sizes.
 - Fixed copy&paste typo inside `meta_checktxnid()`.
 - Minor fix `mdbx_env_set_geometry()` to avoid returning `EINVAL` in particular rare cases.
 - Minor refine/fix batch-get testcase for large page size.
 - Fixed schema memory leak in case `FPTA_APP_MISMATCH` error.
 - Fixed insignificant ASAN issue inside tests.

26 files changed, 290 insertions(+), 167 deletions(-)
Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
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