[PATCH twm] Stop warning of putenv

[Alistair Leslie-Hughes]

Hi,

This add the putenv defined into utils.h. Usually putenv
is found in stdlib.h but it protected by on Linux, so it
not included.
#if defined __USE_SVID || defined __USE_XOPEN

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=32696

Best Regards

Alistair Leslie-Hughes
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