gnu: xf86-video-r128: Fix FTBFS with xorg-server >= 1.20.

* gnu/packages/xorg.scm (xf86-video-r128): Update to 6.10.2-0.c4c878d.
[source]: Use GIT-FETCH.
[arguments]: Add 'prevent-configure' phase.
[native-inputs]: Add AUTOCONF, AUTOMAKE and LIBTOOL.

gnu/packages/xorg.scm

@@ -3175,33 +3175,47 @@ This driver is intended for the spice qxl virtio device.")
     (home-page "http://www.spice-space.org")
     (license license:x11)))
 
-
 (define-public xf86-video-r128
+  ;; We need a newer version than 6.10.2 to build against the latest xorg-server.
+  ;; Remove this binding and the bootstrap inputs when >6.10.2 is released.
+  (let ((commit "c4c878d2ccb75fa75afe46e0e50ee9975c5c57fc")
+        (revision "0"))
     (package
       (name "xf86-video-r128")
-    (version "6.10.2")
+      (version (git-version "6.10.2" revision commit))
-    (source
+      (source (origin
-      (origin
+                (method git-fetch)
-        (method url-fetch)
+                (uri (git-reference
-        (uri (string-append
+                      (url (string-append "https://anongit.freedesktop.org/git/xorg"
-               "mirror://xorg/individual/driver/xf86-video-r128-"
+                                          "/driver/" name ".git"))
-               version
+                      (commit commit)))
-               ".tar.bz2"))
+                (file-name (git-file-name name version))
                 (sha256
                  (base32
-           "1pkpka5m4cd6iy0f8iqnmg6xci14nb6887ilvxzn3xrsgx8j3nl4"))))
+                  "01pff30zz4zxjhw28h8bn9x2kq7c6iswgn19b72wnfgl0arxb63j"))))
       (build-system gnu-build-system)
+      (arguments
+       `(#:phases (modify-phases %standard-phases
+                    (add-before 'bootstrap 'prevent-configure
+                      (lambda _
+                        ;; Prevent autogen from calling "./configure" as part of
+                        ;; the bootstrap step, which fails due to wrong shebang.
+                        (setenv "NOCONFIGURE" "1")
+                        #t)))))
       (inputs `(("mesa" ,mesa)
                 ("xorgproto" ,xorgproto)
                 ("xorg-server" ,xorg-server)))
-    (native-inputs `(("pkg-config" ,pkg-config)))
+      (native-inputs
+       `(("pkg-config" ,pkg-config)
+         ("autoconf" ,autoconf)
+         ("automake" ,automake)
+         ("libtool" ,libtool)))
       (home-page "https://www.x.org/wiki/")
       (synopsis "ATI Rage 128 video driver for X server")
       (description
        "xf86-video-r128 is a video driver for the Xorg X server.
 This driver is intended for ATI Rage 128 based cards.")
-    (license license:x11)))
+      (license license:x11))))
-
 
 (define-public xf86-video-savage
   (package