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For test tools it's better to use assert_se() rather than assert(),
since the former is not optimized away, even if -DNDEBUG is used. That
means the test program now retains its usefulness even if -DNDEBUG is
used.
This also adds in some OOM checks, to be extra anal...
Now, actually check if the environment variable names and values used
are valid, before accepting them. With this in place are at some places
more rigid than POSIX, and less rigid at others. For example, this code
allows lower-case environment variables (which POSIX suggests not to
use), but it will not allow non-UTF8 variable values.
All in all this should be a good middle ground of what to allow and what
not to allow as environment variables.
(This also splits out all environment related calls into env-util.[ch])
