gnu: go-github-com-songmu-gitconfig: Move to golang-xyz.

* gnu/packages/golang.scm (go-github-com-songmu-gitconfig): Move from
here ...
* gnu/packages/golang-xyz.scm: ... to here.

* gnu/packages/version-control.scm: Add (gnu packages golang-xyx)
module.

Change-Id: Ibab2595d981d46096501bb8ab495e899d2aacf7d

gnu/packages/golang.scm

@@ -8960,32 +8960,6 @@ modifying them.")
 parsers, and related tools.")
       (license license:expat))))
 
-(define-public go-github-com-songmu-gitconfig
-  (package
-    (name "go-github-com-songmu-gitconfig")
-    (version "0.1.0")
-    (home-page "https://github.com/songmu/gitconfig")
-    (source
-     (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url home-page)
-             (commit (string-append "v" version))))
-       (file-name (git-file-name name version))
-       (sha256
-        (base32 "1y01h496a7pfj1g2bclls5b0nl3vnj7nz610jj1dzq9kxrwxk7fk"))))
-    (build-system go-build-system)
-    (arguments
-     `(#:import-path "github.com/Songmu/gitconfig"
-       ;; Package's tests appear to be hardcoded to the author's gitconfig
-       ;; and require network access.
-       #:tests? #f))
-    (propagated-inputs
-     (list go-github-com-goccy-yaml))
-    (synopsis "Go library to get configuration values from gitconfig")
-    (description "@{gitconfig} is a package to get configuration values from gitconfig.")
-    (license license:expat)))
-
 (define-public go-github-com-akosmarton-papipes
   (let ((commit "3c63b4919c769c9c2b2d07e69a98abb0eb47fe64")
         (revision "0"))