binutils: use a no-op for makeinfo

This way, we don't have to touch every file generated from one we
patch.  It also makes it possible to do an out-of-tree build —
otherwise, the source files would be copied into the build directory
during Make, so there'd be no opportunity to touch some of them.

This same hack is already used by the minimal-bootstrap binutils.

pkgs/development/tools/misc/binutils/default.nix

@@ -147,22 +147,8 @@ stdenv.mkDerivation (finalAttrs: {
       for i in binutils/Makefile.in gas/Makefile.in ld/Makefile.in gold/Makefile.in; do
           sed -i "$i" -e 's|ln |ln -s |'
       done
-
-      # autoreconfHook is not included for all targets.
-      # Call it here explicitly as well.
-      ${finalAttrs.postAutoreconf}
     '';
 
-  postAutoreconf = ''
-    # As we regenerated configure build system tries hard to use
-    # texinfo to regenerate manuals. Let's avoid the dependency
-    # on texinfo in bootstrap path and keep manuals unmodified.
-    touch gas/doc/.dirstamp
-    touch gas/doc/asconfig.texi
-    touch gas/doc/as.1
-    touch gas/doc/as.info
-  '';
-
   # As binutils takes part in the stdenv building, we don't want references
   # to the bootstrap-tools libgcc (as uses to happen on arm/mips)
   #
@@ -247,6 +233,13 @@ stdenv.mkDerivation (finalAttrs: {
       ]
     );
 
+  makeFlags = [
+    # As we regenerated configure build system tries hard to use
+    # texinfo to regenerate manuals. Let's avoid the dependency
+    # on texinfo in bootstrap path and keep manuals unmodified.
+    "MAKEINFO=true"
+  ];
+
   # Fails
   doCheck = false;