gnu: go-github-com-lib-pq: Move to golang-xyz.

* gnu/packages/syncthing.scm (go-github-com-lib-pq): Move from here ...
* gnu/packages/golang-xyz.scm: ... to here.

* gnu/packages/databases.scm: Remvoe (gnu packages syncthing).

Change-Id: I0f2f9c2366fd47b7167044d76f8c2c67a2f65544

gnu/packages/syncthing.scm

@@ -424,31 +424,6 @@ address of the default LAN gateway.")
     (home-page "https://github.com/jackpal/gateway")
     (license bsd-3)))
 
-(define-public go-github-com-lib-pq
-  (package
-    (name "go-github-com-lib-pq")
-    (version "1.2.0")
-    (source (origin
-              (method git-fetch)
-              (uri (git-reference
-                    (url "https://github.com/lib/pq")
-                    (commit (string-append "v" version))))
-              (file-name (git-file-name name version))
-              (sha256
-               (base32
-                "08j1smm6rassdssdks4yh9aspa1dv1g5nvwimmknspvhx8a7waqz"))))
-    (build-system go-build-system)
-    (arguments
-     `(#:import-path "github.com/lib/pq"
-       ;; The tests seem to fail without access to the network or a running
-       ;; Postgres instance.
-       #:tests? #f))
-    (synopsis "Golang Postgres driver for Go's database/sql")
-    (description "This package provides a pure Go Postgres driver for Go's
-database/sql package.")
-    (home-page "https://github.com/lib/pq")
-    (license expat)))
-
 (define-public go-github-com-oschwald-geoip2-golang
   (package
     (name "go-github-com-oschwald-geoip2-golang")