init:get_arguments() lacks -env assignments

[Michael Truog]

It would be nice if the -env flags would be passed onto the higher
layers so they are accessible in the init module.  That way, programs
that use the slave module can pass on the same environment to other
machines, assuming they are all setup the same.  I do not know of other
command line flags that are inaccessible within the Erlang VM by the
init module, the documentation doesn't mention any.  All the init
functions are affected, not just get_arguments().  An example is below:

$ erl -env A_SHELL_VARIABLE 1
Erlang R13B01 (erts-5.7.2) [source] [64-bit] [smp:4:4] [rq:4]
[async-threads:0] [kernel-poll:false]

Eshell V5.7.2  (abort with ^G)
1> init:get_arguments().
[{root,["/home/user/installed/lib/erlang"]},
 {progname,["erl"]},
 {home,["/home/user"]}]
2>


Thanks,
Michael Truog