This allows to build SQLite with support for the batch-atomic write
optimization. It makes use of atomic write support provided by the
underlying file system. Currently, this is only supported on F2FS. It
it does not work with overlayfs.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>

Pull request #9033 showed that there are problems with builds where
thread-safe mode is disabled. The binaries still reference functions
from libpthread. This commit removes the thread-safe choice for now.
Once this is addressed upstream the choice can be added back.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

Adds (most) configure switches to menuselect. The defaults are _not_
changed, meaning the default configuration itself remains the same.

This enables changing the configuration through menuselect and adds
flags that other packages may use.

Config.in is renamed to Config-lib.in in anticipation of a future commit
where the cli tool package also gets a file to source.

The variables also get a prefix change from SQLITE to SQLITE3 in case
there will be a new major release in the future that may coexist with
sqlite3.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>