Bootstrap tools for the upcoming new darwin stdenv (not working yet in this stdenv, but will soon)

pkgs/stdenv/darwin/unpack-bootstrap-tools.sh

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+set -e
+
+# Unpack the bootstrap tools tarball.
+echo Unpacking the bootstrap tools...
+$mkdir $out
+$bzip2 -d < $tarball | (cd $out && $cpio -i)
+
+# Set the ELF interpreter / RPATH in the bootstrap binaries.
+echo Patching the tools...
+
+export PATH=$out/bin
+
+for i in $out/bin/*; do
+  if ! test -L $i; then
+    echo patching $i
+    install_name_tool -add_rpath $out/lib $i || true
+  fi
+done
+
+for i in $out/lib/*.dylib $out/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation; do
+  if ! test -L $i; then
+    echo patching $i
+
+    id=$(otool -D "$i" | tail -n 1)
+    install_name_tool -id "$(dirname $i)/$(basename $id)" $i
+
+    libs=$(otool -L "$i" | tail -n +2 | grep -v libSystem | cat)
+    if [ -n "$libs" ]; then
+      install_name_tool -add_rpath $out/lib $i
+    fi
+  fi
+done
+
+ln -s bash $out/bin/sh
+ln -s bzip2 $out/bin/bunzip2
+
+# Provide a gunzip script.
+cat > $out/bin/gunzip <<EOF
+#!$out/bin/sh
+exec $out/bin/gzip -d "\$@"
+EOF
+chmod +x $out/bin/gunzip
+
+# Provide fgrep/egrep.
+echo "#! $out/bin/sh" > $out/bin/egrep
+echo "exec $out/bin/grep -E \"\$@\"" >> $out/bin/egrep
+echo "#! $out/bin/sh" > $out/bin/fgrep
+echo "exec $out/bin/grep -F \"\$@\"" >> $out/bin/fgrep
+
+cat >$out/bin/dsymutil << EOF
+#!$out/bin/sh
+EOF
+
+chmod +x $out/bin/egrep $out/bin/fgrep $out/bin/dsymutil