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Up to [DVB] / dietlibc

  grep portability fixes (Gunnar Ritter)
  add empty libcrypt.a to help compile code from others (Gunnar Ritter)
  add make uninstall

#!/bin/sh
(gcc -E - << EOF | grep WANT_THREAD_SAFE > /dev/null) || echo libpthread/pthread_*.c
#include "dietfeatures.h"
WANT_THREAD_SAFE
EOF