[sudo-workers] hooking of getenv broke SUDO_ASKPASS in 1.8.5

[Mike Frysinger]

the new sudo code base exports the getenv symbol allowing it to hook all calls 
to the environment.  this broke the SUDO_ASKPASS functionality as the initial 
env setup in plugins/sudoers/env.c:rebuild_env() removed it, and the hooked 
getenv call in src/tgetpass.c returns NULL.

not sure how people want to fix it.  maybe whitelist the variable in 
initial_keepenv_table ?  extract it earlier and save it into the askpass 
variable (overriding the config settings) ?
-mike
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