message: Remove unused ptrace.h
diff: #if defined(__FreeBSD__)
  #include <sys/param.h> // MAXPATHLEN
  #include <sys/sysctl.h> // sysctl
  -#elif defined(__APPLE__) || defined(__BSD__)
  -#include <sys/ptrace.h>
  #elif defined(__linux__)
  #include <malloc.h>
  -#include <sys/ptrace.h>
  #endif
  #include <iostream>
  