sqlite: Upgrade to SQLite 3.19.4

Downloaded from https://sqlite.org/src/tarball/SQLite-2dd0c77d.tar.gz
$ shasum SQLite-2dd0c77d.tar.gz
354575e725f1301ed52984bd06d7b803b2134f5a  SQLite-2dd0c77d.tar.gz

Unpack and run
"./configure; make sqlite3.c" to generate the "sqlite3.c",
"sqlite3.h", "shell.c", and "sqlite3ext.h" source files

dist/orig contains the stock sqlite3 code, as generated from the
tar.gz file above.

This release provides a fix for
https://sqlite.org/src/info/de3403bf5ae5f72ed

The proposed solution makes column names more consistent and easier to
understand. It also makes the implementation smaller and simpler and
helps it to run a little faster. However, there may be legacy programs
that depended on the old behavior (shifting the column naming rule from
(2) to (3) when using the query flattener) and those legacy programs
could potentially break due to this change.

Test: manual + SQLiteDatabaseTest CTS test
Bug: 62431773
Change-Id: I44f9bafe888b22b040fa1827962c421b4eab0c3a