[Toybox] interesting new (?) env(1) options

[enh]

i've never noticed these before:

       --block-signal[=SIG]
              block delivery of SIG signal(s) to COMMAND

       --default-signal[=SIG]
              reset handling of SIG signal(s) to the default

       --ignore-signal[=SIG]
              set handling of SIG signal(s) to do nothing

i've not yet _needed_ them, but fyi in case anyone does. (the motivating
example in the man page is "making sure SIGPIPE actually works in a child,
regardless of the caller's signal disposition".)
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