This function returns the SQLite library version as an integer.
The number is in the form Mmmmppp, with M being the major version, m the minor, and p the point release. Smaller
steps are not included. The version number of SQLite v3.6.23.1
(and v3.6.23) is 3006023.
This value is also available at compile time as the SQLITE_VERSION_NUMBER macro. By
comparing the macro used at compile time to the value returned
at runtime, an application can verify that it is linking against
a proper version of the library.