[PROJ] PSC Motion: require SQLite 3.11 as minimum version

[Even Rouault]

Hi,

It has been reported that PROJ 6.2.1 (also applies to master) runs super slow 
if used with a too old SQLite version (https://github.com/OSGeo/PROJ/issues/
1718). It works fine with SQLite 3.11 (as found on Ubuntu 16.04 for example). 
SQLite 3.11 was released on 2016-02-15, so meets our "older than 2 years" 
rule.

Hence the following motion
~~
Require SQLite 3.11 for PROJ master
~~

+1 Even

PR implementing this ready in https://github.com/OSGeo/PROJ/pull/1721
Will apply for PROJ 6.3

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