0156fcd Backport useful os:getenv/2 from master

Authored and Committed by peter 9 years ago
    Backport useful os:getenv/2 from master
    
    See this GitHub pull request for further details:
    
    * https://github.com/erlang/otp/pull/535
    
    Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
    
        
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