SQLite driver: support tables WITHOUT ROWID

[rouault]

When opening a SQLite database with tables created WITHOUT ROWID (such as proj.db of PROJ master now), we emit errors like "ERROR 1: Unable to query table axis for column definitions : no such column: rowid.". We shouldn't do that, and we should generate a pure OGR incremented FID on them. A downside of without rowid tables is that OLCRandomRead shouldn't be advertized and GetFeature() will be slow, but that's OK.