[patch] Error if an extern "C" declaration matches a previous hidden extern "C" declaration

[Rafael Espíndola]

Without this patch we produce an error for


extern "C" {
  void f() {
    extern int b;
  }
}

extern "C" {
  extern float b;
}


but not for

extern "C" {
  void f() {
    extern int b;
  }
}

extern "C" {
  float b;
}


Cheers,
Rafael
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