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Create a small wrapper for setenv() for portability to Windows

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Closed

#178

@coryan

Description

Some of our tests need to set environment variables. We need a wrapper for ::setenv() as this is a Unix specific call. h/t @mbrukman that we can use this trick from abseil:

#ifdef WIN32
#include <windows.h>
#endif

#ifdef WIN32
      SetEnvironmentVariable(...);
#else
      setenv(...);
#endif