sqlite: Upgrade to SQLite 3.19.4 release

Downloaded from https://sqlite.org/src/tarball/SQLite-605907e7.tar.gz
$ shasum SQLite-605907e7.tar.gz
4ac33e2ce69553fdb929e394823267a604b19211  SQLite-605907e7.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 update simply switches from batch-atomic-write-3.19 branch to an
official release. No code changes.

Test: manual
Bug: 64849849
Change-Id: Ibbf0bca7ec498a670487adf8f0ffbfa19a44bbbf
diff --git a/README.version b/README.version
index 1facd25..58f47fa 100644
--- a/README.version
+++ b/README.version
@@ -1,4 +1,3 @@
-URL: https://sqlite.org/src/tarball/SQLite-2dd0c77d.tar.gz
-Version: 3.19.4 2dd0c77d54b333be
-Branch: batch-atomic-write-3.19
+URL: https://sqlite.org/src/tarball/SQLite-605907e7.tar.gz
+Version: 3.19.4 605907e73adb4533
 BugComponent: 24950