[ft] getenv() Used Instead of ft_getenv()

[Mickey Gabel]

ft_debug_init uses getenv, but it should probably be ft_getenv which 
should be defined in ft_stdlib. This only happens when building with 
FT_DEBUG_LEVEL_ERROR, so probably most people aren't affected.

WinCE for example, doesn't have environment variables, so people 
building for it need to be able to find it and replace with something 
else (like getting the value from the registry).

Regards,
        Mickey