unsafe fn really_init(argc: isize, argv: *const *const u8)Available on AIX or Android or Cygwin or DragonFly BSD or Emscripten or FreeBSD or Fuchsia or GNU/Hurd or Haiku or Hermit or Horizon or illumos or L4Re or Linux or NetBSD or NuttX or OpenBSD or QNX Neutrino or Redox OS or RTEMS OS or Solaris or VxWorks only.