gnu: Move sqlite to separate module.

* gnu/packages/databases.scm (sqlite, sqlite-3.26.0, sqlite-with-fts5,
sqlite-with-column-metadata): Move variables from here...
* gnu/packages/sqlite.scm: ...to this new module.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/apl.scm,
gnu/packages/bittorrent.scm,
gnu/packages/calendar.scm,
gnu/packages/code.scm,
gnu/packages/crypto.scm,
gnu/packages/databases.scm,
gnu/packages/dc.scm,
gnu/packages/disk.scm,
gnu/packages/ebook.scm,
gnu/packages/education.scm,
gnu/packages/emacs.scm,
gnu/packages/emulators.scm,
gnu/packages/file-systems.scm,
gnu/packages/freedesktop.scm,
gnu/packages/ftp.scm,
gnu/packages/games.scm,
gnu/packages/geo.scm,
gnu/packages/gnome.scm,
gnu/packages/gnunet.scm,
gnu/packages/gnupg.scm,
gnu/packages/gnuzilla.scm,
gnu/packages/gps.scm,
gnu/packages/guile.scm,
gnu/packages/ibus.scm,
gnu/packages/kerberos.scm,
gnu/packages/kodi.scm,
gnu/packages/lisp.scm,
gnu/packages/mail.scm,
gnu/packages/messaging.scm,
gnu/packages/mpd.scm,
gnu/packages/music.scm,
gnu/packages/networking.scm,
gnu/packages/nfs.scm,
gnu/packages/ocaml.scm,
gnu/packages/package-management.scm,
gnu/packages/pdf.scm,
gnu/packages/photo.scm,
gnu/packages/php.scm,
gnu/packages/python.scm,
gnu/packages/qt.scm,
gnu/packages/ruby.scm,
gnu/packages/scheme.scm,
gnu/packages/sync.scm,
gnu/packages/syndication.scm,
gnu/packages/version-control.scm,
gnu/packages/video.scm,
gnu/packages/web-browsers.scm,
gnu/packages/webkit.scm: Adjust module references.

gnu/packages/databases.scm

@@ -90,6 +90,7 @@
   #:use-module (gnu packages readline)
   #:use-module (gnu packages ruby)
   #:use-module (gnu packages serialization)
+  #:use-module (gnu packages sqlite)
   #:use-module (gnu packages tcl)
   #:use-module (gnu packages terminals)
   #:use-module (gnu packages textutils)
@@ -1144,87 +1145,6 @@ browse and edit the contents, add and delete entries, all while tracking your
 changes.")
       (license license:gpl3+)))) ; no headers, see README.md
 
-(define-public sqlite
-  (package
-   (name "sqlite")
-   (replacement sqlite-3.26.0)
-   (version "3.24.0")
-   (source (origin
-            (method url-fetch)
-            (uri (let ((numeric-version
-                        (match (string-split version #\.)
-                          ((first-digit other-digits ...)
-                           (string-append first-digit
-                                          (string-pad-right
-                                           (string-concatenate
-                                            (map (cut string-pad <> 2 #\0)
-                                                 other-digits))
-                                           6 #\0))))))
-                   (string-append "https://sqlite.org/2018/sqlite-autoconf-"
-                                  numeric-version ".tar.gz")))
-            (sha256
-             (base32
-              "0jmprv2vpggzhy7ma4ynmv1jzn3pfiwzkld0kkg6hvgvqs44xlfr"))))
-   (build-system gnu-build-system)
-   (inputs `(("readline" ,readline)))
-   (arguments
-    `(#:configure-flags
-      ;; Add -DSQLITE_SECURE_DELETE, -DSQLITE_ENABLE_UNLOCK_NOTIFY and
-      ;; -DSQLITE_ENABLE_DBSTAT_VTAB to CFLAGS.  GNU Icecat will refuse
-      ;; to use the system SQLite unless these options are enabled.
-      (list (string-append "CFLAGS=-O2 -DSQLITE_SECURE_DELETE "
-                           "-DSQLITE_ENABLE_UNLOCK_NOTIFY "
-                           "-DSQLITE_ENABLE_DBSTAT_VTAB"))))
-   (home-page "https://www.sqlite.org/")
-   (synopsis "The SQLite database management system")
-   (description
-    "SQLite is a software library that implements a self-contained, serverless,
-zero-configuration, transactional SQL database engine.  SQLite is the most
-widely deployed SQL database engine in the world.  The source code for SQLite
-is in the public domain.")
-   (license license:public-domain)))
-
-(define-public sqlite-3.26.0
-  (package (inherit sqlite)
-    (version "3.26.0")
-    (source (origin
-              (method url-fetch)
-              (uri (let ((numeric-version
-                          (match (string-split version #\.)
-                            ((first-digit other-digits ...)
-                             (string-append first-digit
-                                            (string-pad-right
-                                             (string-concatenate
-                                              (map (cut string-pad <> 2 #\0)
-                                                   other-digits))
-                                             6 #\0))))))
-                     (string-append "https://sqlite.org/2018/sqlite-autoconf-"
-                                    numeric-version ".tar.gz")))
-              (sha256
-               (base32
-                "0pdzszb4sp73hl36siiv3p300jvfvbcdxi2rrmkwgs6inwznmajx"))))))
-
-;; This is used by Tracker.
-(define-public sqlite-with-fts5
-  (package/inherit sqlite
-    (name "sqlite-with-fts5")
-    (arguments
-     (substitute-keyword-arguments (package-arguments sqlite)
-       ((#:configure-flags flags)
-        `(cons "--enable-fts5" ,flags))))))
-
-;; This is used by Qt.
-(define-public sqlite-with-column-metadata
-  (package/inherit sqlite
-    (name "sqlite-with-column-metadata")
-    (arguments
-     (substitute-keyword-arguments (package-arguments sqlite)
-       ((#:configure-flags flags)
-        `(list (string-append "CFLAGS=-O2 -DSQLITE_SECURE_DELETE "
-                              "-DSQLITE_ENABLE_UNLOCK_NOTIFY "
-                              "-DSQLITE_ENABLE_DBSTAT_VTAB "
-                              "-DSQLITE_ENABLE_COLUMN_METADATA")))))))
-
 (define-public tdb
   (package
     (name "tdb")