[erlang-patches] fix system_flag warning message

[Steve Vinoski]

Passing certain arguments to erlang:system_flag/2 results in an error
report containing a deprecation warning saying the arguments will be
removed in R16. Since that release is already out, keep the warning message
but change the target removal release to Erlang 18.

https://github.com/erlang/otp/pull/195

I already ran this by Rickard, and he suggested 18 as the target version.

--steve
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