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ugh, touched all stdio and ripped out the non-ungetc and unbuffered
modes.  Did some ELF weak symbol trickery to make `puts("foo")' not
reference the whole stdio crap.

#include <dietstdio.h>

int fputc(int c, FILE *stream) {
  int tmp;
  pthread_mutex_lock(&stream->m);
  tmp=fputc_unlocked(c,stream);
  pthread_mutex_unlock(&stream->m);
  return tmp;
}