openjdk-bootstrap: Don't depend on the length of the Glibc version

Building the bootstrap OpenJDK failed if the Glibc version string is
not 4 characters, e.g. "2.12.1" would cause a corrupt tarball.

pkgs/development/compilers/openjdk/bootstrap.nix

@@ -16,9 +16,13 @@ let
 in
 
 runCommand "openjdk-bootstrap" {} ''
-  xz -dc ${src} | sed "s/e*-glibc-[^/]*/$(basename ${glibc})/g" | tar xv
+  tar xvf ${src}
   mv openjdk-bootstrap $out
 
+  for i in $out/bin/*; do
+    patchelf --set-interpreter ${glibc}/lib/ld-linux*.so.2 $i
+  done
+
   # Temporarily, while NixOS's OpenJDK bootstrap tarball doesn't have PaX markings:
   exes=$(${file}/bin/file $out/bin/* 2> /dev/null | grep -E 'ELF.*(executable|shared object)' | sed -e 's/: .*$//')
   for file in $exes; do