Example:
    export ERL_AFLAGS=-test
    erl dummy_param

In the above example, the dummy_param would be interpreted
as an argument to -test, and not as a separate argument as
it should.

This was previously used when erlexec needed to decide
whether to run the smp or non-smp emulator.

* sverker/heart-nice-exit/OTP-15599:
  erts: Avoid heart killing a nicely exiting emulator

Symptom:
Heart kills exiting emulator before is has flushed all ports
and with HEART_KILL_SIGNAL=SIGABRT it may also produce
unnecessary core dumps from doing init:reboot() for example.

Problem:
Heart port is closed together with all the others in handle_reap_ports()
which is detected by heart OS process.

Solution 1:
Leave the heart port alone in handle_reap_ports() and let it be closed
by OS when emulator exists. It doesn't need to be flushed anyway.

Solution 2:
When heart OS process gets EOF on connection let it wait max 5 seconds
for emulator process to self terminate before trying to kill it.

This reverts commit ea0e763e953f9c7d1fa9c142f24cb95f56119c56.

* maint:
  Add -ztma option for enabling tuple calls
  Reinstate tuple calls support in the beam emulator