Initial configure support for linking certain binaries to libsqlite3.so instead of...

Initial configure support for linking certain binaries to libsqlite3.so instead of embedding it dynamically (which they typically do). This currently applies only to sqldiff, but support for adding the same for other tools is planned. This requires disabling the soname because setting it causes the build to link to whatever libsqlite3.so.0 is installed system-wide, so the soname now defaults to off.

FossilOrigin-Name: 9192c146e2898456a6b8ea43a6f02c0227ddce5b584374fbeb2d63bd2ecd5d8c