gnu: git: Fix missing native-inputs after commit 4cf1acc7f3.

* gnu/packages/version-control.scm (git)[native-inputs]: Restore
native-inputs to what they were prior to the merge commit 4cf1acc7f3.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/version-control.scm

@@ -254,9 +254,12 @@ (define-public git
              "0xf7ki90xw77nvmnkw50xaivyfi8jddfq0h8crzi7m9zjs7aa8mm"))))
        ;; For subtree documentation.
        ("asciidoc" ,asciidoc)
+       ("docbook2x" ,docbook2x)
        ("docbook-xsl" ,docbook-xsl)
-       ("xmlto" ,xmlto)
-       ("pkg-config" ,pkg-config)))
+       ("libxslt" ,libxslt)
+       ("pkg-config" ,pkg-config)
+       ("texinfo" ,texinfo)
+       ("xmlto" ,xmlto)))
     (inputs
      `(("curl" ,curl)
        ("expat" ,expat)