Merge pull request #47930 from jamtrott/gnulib

gnulib: add a symlink from bin/gnulib-tool to gnulib-tool

pkgs/development/tools/gnulib/default.nix

···
   installPhase = ''
     mkdir -p $out; mv * $out/
     ln -s $out/lib $out/include
+    mkdir -p $out/bin
+    ln -s $out/gnulib-tool $out/bin/
   '';
 
   meta = {