[Bug-wget] Configure cleanup

[Darshit Shah]

I cleanup up configure.ac slightly.

It's not complete, but this is in my opinion a step up from what we had already. 
If everyone is fine with it, I'll push this version of the patch.

The first patch adds the -Wextra CFLAG by default on systems where a CFLAG 
variable is not already defined.

--
Thanking You,
Darshit Shah

0001-Add-the-Wextra-flag-by-default.patch
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0002-configure-Clean-up-some-stuff.patch
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