[patch] eliminate use-cases of obsolete functions

[Ralf Corsepius]

Hi,

The patch below is aiming at eliminating two use-cases of functions 
POSIX has declared obsolete.

Ralf

NB.: I am not sure, if using memcpy instead of bcopy is correct or if 
this bcopy should better be replaced with memmove, because I don't know 
if setenv_r's src/dst memory areas may overlap or not.
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