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mtext_getenv(3m17n) on Linux

The text c61eb285c6cb, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.

Get an environment variable.

mtext_getenv(3m17n) on Linux now