guile_2_0: use fetchFromSavannah

Further, use fetchpatch2

pkgs/development/interpreters/guile/2.0.nix

@@ -1,9 +1,11 @@
 { lib
+, autoreconfHook
 , boehmgc
 , buildPackages
 , coverageAnalysis ? null
-, fetchpatch
-, fetchurl
+, fetchpatch2
+, fetchFromSavannah
+, flex
 , gawk
 , gmp
 , libffi
@@ -14,16 +16,18 @@
 , pkgsBuildBuild
 , readline
 , stdenv
+, texinfo
 # Boolean flags
 , runCoverageAnalysis ? false
 }:
 
 let
   pname = "guile";
   version = "2.0.13";
-  src = fetchurl {
-    url = "mirror://gnu/guile/guile-${version}.tar.xz";
-    sha256 = "12yqkr974y91ylgw6jnmci2v90i90s7h9vxa4zk0sai8vjnz4i1p";
+  src = fetchFromSavannah {
+    repo = "guile";
+    rev = "v${version}";
+    hash = "sha256-aImjL3T1NkSlXVeykd5dMHhQc4gzPKCkIZTSxKGgKeg=";
   };
 
   builder = if runCoverageAnalysis
@@ -46,16 +50,16 @@ builder {
     # RISC-V endianness
     ./riscv.patch
     # Fixes stability issues with 00-repl-server.test
-    (fetchpatch {
+    (fetchpatch2 {
       url = "https://git.savannah.gnu.org/cgit/guile.git/patch/?id=2fbde7f02adb8c6585e9baf6e293ee49cd23d4c4";
-      sha256 = "0p6c1lmw1iniq03z7x5m65kg3lq543kgvdb4nrxsaxjqf3zhl77v";
+      hash = "sha256-y24XMuwe14esLF3wBZ0z1OLp1E8KfLjrN9R3lP8vzLo=";
     })] ++
   (lib.optionals runCoverageAnalysis [ ./gcov-file-name.patch ])
   ++ lib.optionals stdenv.hostPlatform.isDarwin [
     ./filter-mkostemp-darwin.patch
-    (fetchpatch {
+    (fetchpatch2 {
       url = "https://gitlab.gnome.org/GNOME/gtk-osx/raw/52898977f165777ad9ef169f7d4818f2d4c9b731/patches/guile-clocktime.patch";
-      sha256 = "12wvwdna9j8795x59ldryv9d84c1j3qdk2iskw09306idfsis207";
+      hash = "sha256-DI9nIIyZtRAEV/jQQdHPVRthMBOkanjzi5SvavDL3qU=";
     })
   ];
 
@@ -67,8 +71,11 @@ builder {
   ];
 
   nativeBuildInputs = [
+    autoreconfHook
+    flex
     makeWrapper
     pkg-config
+    texinfo
   ];
 
   buildInputs = [