[Bug-wget] Code cleanup.

[illusionoflife]

Hello again. Sorry, was short on time, and it tooked me time to 
learn flex and bison.

So, this is beta version of patch, that reimplement netrc parsing and cleanup 
some utility functions. All kind of constructive critic are welcome. I am not 
finished with tests and integration, but to give community idea. I would like 
to acent attention on `auth_free` function. Why gl_list operates on const 
pointers? I already asked on gnulib list. I did my best to make code clean and 
simple, no-more, then 20 lines function, but probably I missed portability 
issues. 
-- 
Best regards, illusionoflife. 
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